Use matrices A, B, C and D. A = Find CD a. 2 3 0 -5 b. 27 -29 -7 31.0 -384-1 2 6 -6 -6 4 -2 -27 18 -9 -12 8 -4 2 Mark this and return C = 9 and D= [-3 2 -1] C. Please select the best answer from the choices provided | ** - 16 24 -8 0 -40 32 Save and Evil
Answers
The product of matrices C and D is:
[tex]CD = \left[\begin{array}{ccc}-6&18&-4\\\end{array}\right][/tex]
The best answer is option b.
How to find the product of two matrices?A matrix (plural matrices) is a set of numbers arranged in rows and columns so as to form a rectangular array.
The number of rows of a matrix can be determined by counting from top to bottom and the number of columns can be determined by counting from left to right.
The product (multiplication) of matrices C and D is:
CD = C * D
[tex]CD = \left[\begin{array}{ccc}2\\9\\4\end{array}\right] * \left[\begin{array}{ccc}-3&2&-1\\\end{array}\right][/tex]
To get the product, multiply each row by the column. That is:
2 * (-3) = -6
9 * 2 = 18
4 * (-1) = -4
[tex]CD = \left[\begin{array}{ccc}-6&18&-4\\\end{array}\right][/tex]
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Related Questions
A researcher would like to examine how the chemical tryptophan, contained in foods such as turkey, can reduce mental alertness. a sample of n = 9 college students is obtained, and each student’s performance on a familiar video game is measured before and after eating a traditional thanksgiving dinner including roasted turkey. the average mental alertness score dropped by md= 14 points after the meal with ss= 1152 for the difference scores.
a. is there is significant reduction in mental alertness after consuming tryptophan versus before? use a one-tailed test with α = .05.
b. compute r2 to measure the size of the effect.
Answers
r2 = 0.523, which means that approximately 52.3% of the variance in the difference scores can be accounted for by the reduction in mental alertness after consuming tryptophan.
a. To test whether there is a significant reduction in mental alertness after consuming tryptophan versus before, we can use a paired samples t-test. The null hypothesis is that there is no difference in mental alertness scores before and after the meal, and the alternative hypothesis is that the scores are lower after the meal:
H0: μd = 0 (no difference)
Ha: μd < 0 (lower scores after the meal)
Here, μd is the mean difference score in mental alertness before and after the meal. We will use a one-tailed test with α = .05, since we are only interested in the possibility of lower scores after the meal.
The t-statistic for a paired samples t-test is calculated as:
t = (Md - μd) / (sd / sqrt(n))
Where Md is the mean difference score, μd is the hypothesized mean difference (in this case, 0), sd is the standard deviation of the difference scores, and n is the sample size.
We are given that Md = 14, and the standard deviation of the difference scores (sd) is:
sd = sqrt(SSd / (n - 1)) = sqrt(1152 / 8) = 12
Substituting these values, we get:
t = (14 - 0) / (12 / sqrt(9)) = 3.5
Using a one-tailed t-distribution table with 8 degrees of freedom and α = .05, the critical value is -1.86. Since our calculated t-value (3.5) is greater than the critical value, we reject the null hypothesis and conclude that there is a significant reduction in mental alertness after consuming tryptophan versus before.
b. To compute r2 to measure the size of the effect, we can use the formula:
r2 = t2 / (t2 + df)
Where t is the calculated t-value for the test, and df is the degrees of freedom, which is n-1 in this case.
Substituting the values , we get:
r2 = (3.5)2 / ((3.5)2 + 8) = 0.523
Therefore, r2 = 0.523, which means that approximately 52.3% of the variance in the difference scores can be accounted for by the reduction in mental alertness after consuming tryptophan.
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4. Let A be a 3 x 4 matrix and B be a 4 x 5 matrix such that ABx = 0 for all x € R5. a. Show that R(B) C N(A) and deduce that rank(B) < null(A) b. Use the Rank-Nullity theorem to prove that rank(A) + rank(B) < 4.
Answers
a. To show that R(B) is a subset of N(A), let y be any vector in R(B):
This means that there exists a vector x in R4 such that Bx = y.
Now, since ABx = 0 for all x in R5, we can write:
A(Bx) = 0
But we know that Bx = y, so we have:
Ay = 0
This shows that y is in N(A), and therefore R(B) is a subset of N(A).
To deduce that rank(B) is less than null(A), recall that by the Rank-Nullity theorem, we have:
rank(B) + null(B) = dim(R5) = 5
rank(A) + null(A) = dim(R4) = 4
Since R(B) is a subset of N(A), we have null(A) >= rank(B).
Therefore, using the above equations, we get:
rank(B) + null(A) <= null(B) + null(A) = 5
which implies:
rank(B) <= 5 - null(A) = 5 - (4 - rank(A)) = 1 + rank(A)
This shows that rank(B) is less than or equal to 1 plus the rank of A.
Since the rank of A can be at most 3 (since A is a 3 x 4 matrix),
we conclude that:
rank(B) < null(A)
b. To use the Rank-Nullity theorem to prove that rank(A) + rank(B) < 4
We simply add the equations:
rank(A) + null(A) = 4
rank(B) + null(B) = 5
to get:
rank(A) + rank(B) + null(A) + null(B) = 9
But since R(B) is a subset of N(A), we know that null(A) >= rank(B), and therefore:
rank(A) + rank(B) + 2null(A) <= 9
Using the first equation above, we can write null(A) = 4 - rank(A), so we get:
rank(A) + rank(B) + 2(4 - rank(A)) <= 9
which simplifies to:
rank(A) + rank(B) <= 1
Since rank(A) is at most 3,
we conclude that:
rank(A) + rank(B) < 4
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Put the numbers in order from least to greatest.
4.27, 2.704, 4.2, 2.74, 4.72
Answers
Answer: 2.704 2.74 4.2 4.27 4.72
Step-by-step explanation:
Express the expression as a single logarithm and simplify. if necessary, round your answer to the nearest thousandth. log2 51.2 − log2 1.6
Answers
Using the quotient rule of logarithms, we have:
=log2 51.2 − log2 1.6
= [tex]log2 (51.2/1.6)[/tex]
Simplifying the numerator, we have:
[tex]log2(51.2/1.6) = log2(32)[/tex]
Using the fact that 32 = 2^5, we have:
log2 32 = log2 2^5 = 5
log2 51.2 − log2 1.6 = log2 (51.2/1.6) = log2 32 = 5
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b) During the first market day, Fatuma bought 30 oranges and 12 mangoes and paid Ksh. 936 for all the fruits. In the second market day, the price of an orange increased by 20% while that of a mango reduced in the ratio 3:4. Fatuma bought 15 oranges and 20 mangoes and paid Ksh. 780 for all the fruits. Given that the cost of an orange and that of a mango during the first market day was Ksh. x and Ksh. y respectively: (i) Write down simultaneous equations to represent the information above. (2 marks) (ii) Use matrix in (a) above to find the cost of an orange and that of a mango in the first market day. (4 marks) (iii) Fatuma sold all the fruits bought on the second market day at a profit of 10% per orange and 15% per mango. Calculate the total amount of money realized for the sales. (2 marks)
Answers
Answer:Let the cost of an orange and that of a mango during the first market day be Ksh. x and Ksh. y respectively.
From the first market day:
30x + 12y = 936
From the second market day:
15(1.2x) + 20(3/4y) = 780
Simplifying the second equation:
18x + 15y = 780
(ii) Using matrix to find the cost of an orange and that of a mango in the first market day:
Rewriting the equations in matrix form:
|30 12| |x| |936|
|18 15| x |y| = |780|
Multiplying the matrices:
|30 12| |x| |936|
|18 15| x |y| = |780|
|30x + 12y| |936|
|18x + 15y| = |780|
Using matrix inversion:
| x | |15 -12| |936 12|
| y | = | -18 30| x |780 15|
|x| |270 12| |936 12|
| | = |-360 30| x |780 15|
|y|
Simplifying the matrix multiplication:
|x| |1194| |12|
| | = | 930| x |15|
|y|
Therefore, the cost of an orange in the first market day was Ksh. 39 and the cost of a mango in the first market day was Ksh. 63.
(iii) Calculation of the total amount of money realized for the sales:
On the second market day, Fatuma bought 15 oranges and 20 mangoes.
Cost of 15 oranges = 15(1.2x) = 18x
Cost of 20 mangoes = 20(3/4y) = 15y
Total cost of fruits bought on the second market day = 18x + 15y = 18(39) + 15(63) = Ksh. 1629
Profit earned on 15 oranges at 10% = 1.1(1.2x)(15) - (1.2x)(15) = 0.18x(15) = 2.7x
Profit earned on 20 mangoes at 15% = 1.15(3/4y)(20) - (3/4y)(20) = 0.15y(20) = 3y
Total profit earned = 2.7x + 3y
Total amount of money realized for the sales = Total cost + Total profit
= Ksh. 1629 + 2.7x + 3y.
Step-by-step explanation:
Find the derivative of the vector function r(t) = ln(7-t^2)i + sqrt(13+tj – 4e^{9t} r’(t) =
Answers
The derivative of the vector function is: r'(t) = (-2t/(7-t^2)) i + (1/(2sqrt(13+t))) j - 36e^(9t) k
We are given a vector function r(t) = ln(7-t^2)i + sqrt(13+t)j – 4e^(9t)k, and we need to find its derivative r'(t).
The derivative of a vector function is obtained by differentiating each component of the vector function separately.
So, let's differentiate each component:
r(t) = ln(7-t^2)i + sqrt(13+t)j – 4e^(9t)k
r'(t) = (d/dt) ln(7-t^2) i + (d/dt) sqrt(13+t) j - (d/dt) 4e^(9t) k
Using the chain rule of differentiation, we have:
r'(t) = -2t/(7-t^2) i + 1/(2sqrt(13+t)) j - 36e^(9t) k
Therefore, the derivative of the vector function is:
r'(t) = (-2t/(7-t^2)) i + (1/(2sqrt(13+t))) j - 36e^(9t) k
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3) Find the maximum and minimum values of f(x,y) = xyon the region inside the triangle whose vertices are (6,2), (0,3), and (6.0).
Answers
Therefore, the maximum value of f(x,y) inside the triangle is 80/9, which occurs along the line y = (-1/2)x + 4 at the point (8/3, 10/3), and the minimum value is -32, which occurs at the critical point (-8,4).
To find the maximum and minimum values of f(x,y) = xy on the region inside the triangle whose vertices are (6,2), (0,3), and (6,0), we use the method of Lagrange multipliers.
First, we need to find the critical points of f(x,y) subject to the constraint that (x,y) lies inside the triangle. We can express this constraint using the equations of the lines that form the sides of the triangle:
y = (-1/2)x + 4
y = (3/2)x
y = 0
Next, we set up the Lagrange multiplier equation:
∇f = λ∇g
where g(x,y) is the equation of the constraint, i.e., the triangle.
We have:
f(x,y) = xy
∇f = <y, x>
g(x,y) = y - (-1/2)x - 4 = 0
∇g = <-1/2, 1>
Setting ∇f = λ∇g, we get:
y = (-1/2)λ
x = λ
Substituting these into the constraint equation, we get:
(-1/2)λ - 4 = 0
Solving for λ, we get:
λ = -8
Substituting this into y = (-1/2)λ and x = λ, we get:
x = -8 and y = 4
Therefore, the only critical point of f(x,y) inside the triangle is (-8,4).
Next, we need to check the values of f(x,y) at the vertices and along the sides of the triangle.
At the vertices:
f(6,2) = 12
f(0,3) = 0
f(6,0) = 0
Along the line y = (3/2)x:
f(x, (3/2)x) = (3/2)x^2
Using the vertex (6,2) and the x-intercept (4/3, 2), we can see that the maximum value of (3/2)x^2 on this line occurs at x = 4. Therefore, the maximum value of f(x,y) along this line is:
f(4,6) = 24
Along the line y = (-1/2)x + 4:
f(x, (-1/2)x + 4) = (-1/2)x^2 + 4x
Using the vertex (6,2) and the x-intercept (8,0), we can see that the maximum value of (-1/2)x^2 + 4x on this line occurs at x = 8/3. Therefore, the maximum value of f(x,y) along this line is:
f(8/3,10/3) = 80/9
Finally, we need to check the values of f(x,y) at the critical point (-8,4). We have:
f(-8,4) = -32
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Estimate 4/5-1/3=
A 3/2
B 1/2
C 0
D 1
Answers
The estimate is 7/15.
The given expression is
4/5-1/3
We see that the denominators of both functions are different
So, the numerators can't be added/subtracted directly.
For this, we need to find the equivalent fraction of the given fractions, and the equivalent fractions should have the same denominator.
Now, the denominators are 5 and 3.
To have a common denominator in both fractions, we find the LCM of the denominators.
∴ The LCM of 5 and 3 = 15
Converting the fraction 4/5 into a fraction with 15 as the denominator,
4/5=4×3/5×3=12/15.
The same for 1/3
1/3= 1×5/3×5=5/15
Replacing 4/5 and 1/3 with the equivalent fractions in the given expression, we get,
12/15-5/15=(12-5)/15=7/15
Hence, the estimate is 7/15.
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How many years would it take for the price of pizza’s ($8.00) to triple with a growth rate of 1.05? Explain how you found your answer.
Answers
It would take 1.53 years for the price of pizza to triple with a growth rate of 1.05.
Calculating the number of yearsTo find the number of years it takes for the price of pizza to triple with a growth rate of 1.05, we need to use the formula for exponential growth:
A = P(1 + r)^t
Where:
A = final amount (triple the original price, or 3*$8 = $24)
P = initial amount ($8)
r = growth rate (1.05)
t = time in years
Substituting the values into the formula, we get:
$24 = $8(1 + 1.05)^t
Simplifying:
3 = (1 + 1.05)^t
Taking the logarithm of both sides with base 10:
log(3) = t*log(1 + 1.05)
t = log(3) / log(1 + 1.05)
Using a calculator, we get:
t ≈ 1.53
Therefore, it would take approximately 1.53 years for the price of pizza to triple with a growth rate of 1.05.
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A lean-to is a shelter where the roof slants down to the ground. The length of the roof of one lean-to is 17 feet. The width of the lean-to is 15 feet. How high is the lean-to on its vertical side?
Answers
The height of the lean-to on its vertical side is 8 feet.
What is the height of a lean-to on its vertical side?
To find the height of the lean-to on its vertical side, we need to use the Pythagorean theorem, which states that in a right triangle, the square of the length of the hypotenuse (the longest side) is equal to the sum of the squares of the other two sides. In this case, the vertical side is the hypotenuse, and the length and width are the other two sides.
So, we have:
[tex]height^2 = hypotenuse^2 - width^2[/tex]
We know the length of the roof (the hypotenuse) is 17 feet, and the width is 15 feet. So we can plug these values into the equation and solve for the height:
[tex]height^2 = 17^2 - 15^2\\height^2 = 289 - 225\\height^2 = 64\\height = 8[/tex]
Therefore, the height of the lean-to on its vertical side is 8 feet.
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A prism 5 feet tall whose base is a right triangle with leg lengths 6 feet and 7 feet
what is the volume in cubic feet?
Answers
The volume of the prism is 21 * 5 = 105 cubic feet.
To find the volume of a prism with a triangular base, you need to follow these steps:
1. Determine the area of the triangular base: Since the base is a right triangle with leg lengths of 6 feet and 7 feet, you can use the formula for the area of a right triangle: (1/2) * base * height. In this case, the area would be (1/2) * 6 * 7 = 21 square feet.
2. Multiply the area of the triangular base by the height of the prism: The prism is 5 feet tall, so the volume can be calculated by multiplying the area of the base (21 square feet) by the height (5 feet).
Thus, the volume of the prism is 21 * 5 = 105 cubic feet.
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i need help fast!!!!
Answers
Answer:
1st choice: 1/4(y - 10) = 2/3
Step-by-step explanation:
the "variable" is y
"is" means "=" (equals sign)
one fourth = 1/4
"difference of" means subtract
Answer: 1/4(y - 10) = 2/3
How is the quotient 7^18/7^-9 expressed as a power of 7
Answers
The quotient of the expression (7¹⁸/7⁻⁹) expressed as a power of 7 is 7 ²⁷.
What is the quotient of the expression?The quotient of the expression is calculated as follows;
When you divide two numbers with the same base, you subtract the exponents of the base. Using this rule, we can simplify the expression as follows;
7¹⁸ / 7⁻⁹
= 7 ⁽¹⁸ ⁻ ⁻⁹⁾
= 7 ⁽¹⁸ ⁺ ⁹⁾
= 7 ²⁷
Therefore, the quotient of the expression (7¹⁸/7⁻⁹) is 7 ²⁷.
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I'LL MARK BRAINLIEST !!!
Which point is the opposite of -5? Plot the point by dragging the black circle to the correct place on the number line.
JUST TELL ME THE CORRECT SPOT PLS!! TY !!!
Answers
Answer:
5
Step-by-step explanation:
The correct spot would be 5 because, on a number line, the opposite of a negative would be its positive counterpart and vise versa.
Jocelyn's car tires are spinning at a rate of 120 revolutions per
minute. If her car's tires are 28 inches in diameter, how many
miles does she travel in 5 minutes? Round to the nearest
hundredth. 63360 inches = 1 mile.
Answers
The required answer is Jocelyn travels approximately 0.83 miles in 5 minutes.
Jocelyn's car tires are spinning at a rate of 120 revolutions per minute. If her car's tires are 28 inches in diameter, we can calculate the distance traveled in one revolution by finding the circumference of the tire:
Circumference = π x diameter
Circumference = 3.14 x 28 inches
Circumference ≈ 87.92 inches
So in one revolution, the car travels approximately 87.92 inches. To find out how many miles Jocelyn travels in 5 minutes, we need to multiply the number of revolutions in 5 minutes (which is 120 revolutions per minute x 5 minutes = 600 revolutions) by the distance traveled in one revolution (87.92 inches).
Distance traveled in 5 minutes = 600 revolutions x 87.92 inches/revolution
Distance traveled in 5 minutes = 52,752 inches
To convert inches to miles, we can use the conversion factor given: 1 mile = 63,360 inches.
Distance traveled in 5 minutes = 52,752 inches ÷ 63,360 inches/mile
Distance traveled in 5 minutes ≈ 0.83 miles
Therefore, Jocelyn travels approximately 0.83 miles in 5 minutes with her car tires spinning at a rate of 120 revolutions per minute. Rounded to the nearest hundredth, the answer is 0.83 miles.
To find out how many miles Jocelyn travels in 5 minutes, follow these steps:
1. Calculate the circumference of one tire: Circumference = Diameter × π.
Circumference = 28 inches × π ≈ 87.96 inches.
2. Determine the distance traveled in one revolution: One revolution covers the circumference of the tire, which is 87.96 inches.
3. Calculate the distance traveled in one minute: 120 revolutions per minute × 87.96 inches per revolution ≈ 10,555.2 inches per minute.
4. Determine the distance traveled in 5 minutes: 10,555.2 inches per minute × 5 minutes = 52,776 inches.
5. Convert the distance from inches to miles: 52,776 inches ÷ 63,360 inches per mile ≈ 0.83 miles.
So, Jocelyn travels approximately 0.83 miles in 5 minutes.
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without using a protractor, you can determine whether the angles are right angles by measuring the length of the diagonal and applying the converse of the pythagorean theorem. 12 cm 13 cm 5 cm 5 cm 12 cm the length of both diagonals for each lateral side is 13 centimeters. from this, can you prove that the lateral sides are rectangles? why or why not?
Answers
Since we have shown that all four angles formed by the lateral sides are right angles, and the opposite sides are parallel and congruent, we can conclude that the lateral sides are rectangles.
How to prove that angles between the 5 cm and 12 cm sides are right angles?Yes, we can prove that the lateral sides are rectangles based on the given information.
Firstly, we can see that the two diagonals of the lateral sides are congruent (both measure 13 cm), which means that the opposite sides of the figure are parallel. This is because, in a rectangle, opposite sides are parallel and congruent.
Next, we can use the converse of the Pythagorean theorem to determine if the angles are right angles. The converse of the Pythagorean theorem states that if the square of the length of the longest side of a triangle is equal to the sum of the squares of the other two sides, then the triangle is a right triangle.
For each of the lateral sides of the figure, we can consider the two triangles formed by one of the diagonals and the adjacent sides. Applying the Pythagorean theorem, we can see that:
For the first lateral side, we have:
(5 cm)^2 + (12 cm)^2 = (13 cm)^2
Therefore, the angles between the 5 cm and 12 cm sides are right angles.
For the second lateral side, we have:
(5 cm)^2 + (12 cm)^2 = (13 cm)^2
Therefore, the angles between the 5 cm and 12 cm sides are also right angles.
Since we have shown that all four angles formed by the lateral sides are right angles, and the opposite sides are parallel and congruent, we can conclude that the lateral sides are rectangles.
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1. sachin's business manufactures cricket bats for the mass market. he advertises in a national
newspaper every two weeks. demand for the cricket bats has rapidly increased since the business
started two years ago. his 30 employees now produce 3 million cricket bats per year.
identify and explain one advantage and one disadvantage to sachin's business of advertising
in a national newspaper.
(4 points)
Answers
Advertising cricket bats in a national newspaper provides Sachin's business with increased brand visibility and reach, while also posing a potential disadvantage due to high advertising costs.
One advantage and one disadvantage of Sachin's business advertising cricket bats in a national newspaper are as follows:
Advantage: Increased brand visibility and reach.
By advertising in a national newspaper, Sachin's business can reach a wider audience, creating greater brand awareness among potential customers. This increased visibility can contribute to the rapid increase in demand for cricket bats, ultimately leading to higher sales and profits for the business.
Disadvantage: High advertising cost.
National newspaper advertising can be quite expensive, especially for a business that advertises every two weeks. The high advertising costs might put financial pressure on Sachin's business, which could potentially affect other aspects of the business operations, such as product quality or employee wages. It's important for Sachin to weigh the benefits of national newspaper advertising against its costs to determine the most effective marketing strategy.
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Let f(x,y) = x⁴ + y⁴ – 4xy +1. Find all critical points. For each critical point, determine whether it is a local maximum, a local minimum, or a saddle point. (At least with my approach, for this problem you'll need to factor x⁹ - x. This factors as x(x² - 1)(x² + 1)(x⁴ + 1)
Answers
The critical points of [tex]f(x,y)[/tex] are: (0,0), (1,1), (-1,-1), [tex](1/\sqrt2,-1/\sqrt2)[/tex], [tex](-1/\sqrt2,1/\sqrt2), (i/\sqrt2,-i/\sqrt2)[/tex], and [tex](-i/\sqrt2,i/\sqrt2)[/tex]. The points (1,1) and (-1,-1) are local maxima, while the remaining critical points are saddle points
How to find the critical points of the function?To find the critical points of the function [tex]f(x,y)[/tex], we need to find where its partial derivatives with respect to x and y are equal to zero:
∂f/∂x = 4x³ - 4y = 0
∂f/∂y = 4y³ - 4x = 0
From the first equation, we get y = x³, and substituting into the second equation, we get:
[tex]4x - 4x^9 = 0[/tex]
Simplifying this equation, we get:
[tex]x(1 - x^8) = 0[/tex]
So the critical points occur at x = 0, x = ±1, and [tex]x = (^+_-i)/\sqrt2[/tex].
To determine the nature of these critical points, we need to look at the second partial derivatives of [tex]f(x,y)[/tex]:
∂²f/∂x² = 12x²
∂²f/∂y² = 12y²
∂²f/ = -4
At (0,0), we have ∂²f/∂x² = ∂²f/∂y² = 0 and ∂²f/∂x ∂y = -4, so this is a saddle point.
At (1,1), we have ∂²f/∂x² = ∂²f/∂y² = 12, and ∂²f/∂x ∂y = -4, so this is a local maximum.
At (-1,-1), we have ∂²f/∂x² = ∂²f/∂y² = 12, and ∂²f/∂x ∂y = -4, so this is also a local maximum.
At , we have ∂²f/∂x² = 6, ∂²f/∂y² = 6, and ∂²f/∂x ∂y = -4, so these are saddle points.
At [tex](i/\sqrt2,-i/\sqrt2)[/tex] and [tex](-i/\sqrt2,i/\sqrt2)[/tex], we have ∂²f/∂x² = -6, ∂²f/∂y² = -6, and ∂²f/∂x ∂y = -4, so these are also saddle points.
Therefore, the critical points of [tex]f(x,y)[/tex] are: [tex](0,0), (1,1), (-1,-1), (1/\sqrt2,-1/\sqrt2), (-1/\sqrt2,1/\sqrt2), (i/\sqrt2,-i/\sqrt2)[/tex], and [tex](-i/\sqrt2,i/\sqrt2)[/tex]. The points (1,1) and (-1,-1) are local maxima, while the remaining critical points are saddle points
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Analyze the diagram below and answer the question that follows.
P
20
10
gg
70
110
A. ZVOU and ZUOS
B. ZROS and ZTOS
C. ZNOP and ZROS
D. ZNOP and ZPOQ
R
80
IN
Image by Scientif38
Name two angles with identical measures.
S
10 110 120
130
ΤΑ
140 150 160 170
30
10
U
Answers
By observing the given protractor we know that option (C) is correct which says ∠NOP = ∠ROS.
What is a protractor?An instrument for measuring angles is a protractor, which is often made of transparent plastic or glass.
Protractors might be straightforward half-discs or complete circles. Protractors with more complex features, like the bevel protractor, include one or two swinging arms that can be used to measure angles.
To draw arcs or circles, use a compass.
To measure angles, one uses a protractor.
So, we need to observe the given image of the protractor:
We will easily find that ∠NOP = ∠ROS
Therefore, by observing the given protractor we know that option (C) is correct which says ∠NOP = ∠ROS.
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A triangle has side lengths of (7a + 2b) centimeters, (6a + 3c) centimeters, and
(3c +46) centimeters. Which expression represents the perimeter, in centimeters,
of the triangle?
Answers
The expression that represents the perimeter of the triangle is 13a + 5c + 2b + 46 centimeters.
So, the expression for the perimeter of the triangle is:
(7a + 2b) + (6a + 3c) + (3c + 46)
Simplifying and combining like terms, we get:
13a + 5c + 2b + 46
Rational functions can also have holes in their graphs, which do when a factor in the numerator and denominator cancel out.
For illustration, the function
[tex]h( x) = ( x2- 4)/(x^{2} )( x- 2)[/tex]has a hole at x = 2,
where the factor ( x- 2) cancels out in the numerator and denominator.
Graphing rational functions can be tricky, but it helps to identify the perpendicular and vertical asymptotes, any holes in the graph, and the of the function near these points.
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A square a rectangle have the same perimeter of a square has a side length of 8x units. The rectangle has a length of (5x + 12) and a width of 10 units. what will be the perimeter of both a rectangle and the square
Answers
Answer:
Step-by-step explanation:
The perimeter of a square is calculated by multiplying the length of one side by 4. Since the side length of the square is 8x units, the perimeter of the square is 4 * 8x = 32x units.
The perimeter of a rectangle is calculated by adding the lengths of all four sides or by using the formula 2 * (length + width). Since the length of the rectangle is (5x + 12) units and the width is 10 units, the perimeter of the rectangle is 2 * ((5x + 12) + 10) = 10x + 44 units.
Since both shapes have the same perimeter, we can set their perimeters equal to each other and solve for x:
32x = 10x + 44 22x = 44 x = 2
Substituting this value of x back into the expression for the perimeter of either shape, we find that the perimeter of both the square and the rectangle is 64 units.
If one line passes through the points (-3,8) & (1,9), and a perpendicular line passes through the point (-2,4), what is another point that would lie on the 2nd line. Select all that apply.
Answers
One point that would lie on the second line is (0,-4). Another possible point on the 2nd line is (0, 12).
To find the equation of the first line, we can use the slope-intercept form:
y = mx + b
where m is the slope and b is the y-intercept. The slope of the line passing through (-3,8) and (1,9) can be found using the formula:
m = (y2 - y1) / (x2 - x1)
m = (9 - 8) / (1 - (-3))
m = 1/4
Using one of the points and the slope, we can find the y-intercept:
8 = (1/4)(-3) + b
b = 9
So the equation of the first line is:
y = (1/4)x + 9
To find the equation of the second line, we need to use the fact that it is perpendicular to the first line. The slopes of perpendicular lines are negative reciprocals, so the slope of the second line is:
m2 = -1/m1 = -1/(1/4) = -4
Using the point-slope form, we can write the equation of the second line:
y - 4 = -4(x + 2)
y - 4 = -4x - 8
y = -4x - 4
To find a point that lies on this line, we can plug in a value for x and solve for y. For example, if we let x = 0, then:
y = -4(0) - 4
y = -4
So the point (0,-4) lies on the second line.
Therefore, another point that would lie on the second line is (0,-4).
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Are the events "having a dog" and "having a cat" independent from each other?
a) Cannot tell with the given information
b) Yes, because P(cat) = P(cat | dog) and P(dog) = P(dog | cat)
c) The events are disjoint
d) No, because P(cat) is not equal to P(cat | dog) and P(dog) is not equal to P(dog | cat)
Answers
Option A) Cannot tell with the given information as the question doesn't provide any information about the relationship between having a dog and having a cat.
Without additional information, we cannot determine if these events are independent, dependent, disjoint, or have any other relationship. Independent events are events in which the occurrence or non-occurrence of one event does not affect the occurrence or non-occurrence of the other event.
In other words, the probability of one event happening does not depend on whether or not the other event happens.
Formally, events A and B are independent if and only if:
P(A ∩ B) = P(A) * P(B)
Where P(A) is the probability of event A occurring, P(B) is the probability of event B occurring, and P(A ∩ B) is the probability of both events A and B occurring simultaneously.
If the above equation holds true, then we can say that events A and B are independent. If not, then events A and B are dependent.
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The city is 30 miles long and two-thirds as wide, and 555,000 citizens currently live there. The mayor calculates that the minimum number of people who would have to move outside the city for adequate services to be maintained is 75,000. Enter the maximum population density , in citizens per square mile , that is assumed in the mayor's calculation
Answers
The maximum population density evaluated is 1200 citizens per square mile, under the condition that the city is 30 miles long and two-thirds as wide, and 555,000 citizens currently live there.
Now to evaluate the maximum population density that is considered in the mayor's calculation is
Let us first calculate the area of the city which is (2/3) × (30 miles)
= 20 miles.
So, now we can calculate the current population density which is
555,000 / (20 × 20)
= 1387.5 citizens per square mile.
Hence the mayor evaluates that at least 75,000 people must transfer out of the city for adequate services to be exercised, we can find the new population as
555,000 - 75,000
= 480,000 citizens.
Therefore, the new population density would be 480,000 / (20 × 20)
= 1200 citizens per square mile
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PART 2:
The regular price, in dollars, the gym charges can be represented by the equation y=15x+20
B.How much money, in dollars, does justin save the first month by joining the gym at the discounted price rather than at the regular price?
Answers
The amount of money Justin saves in the first month would be 5 times the value of x, where x represents the number of months of gym membership, based on the discounted price provided.
What is the linear equation?A linear equation is an equation in mathematics that represents a relationship between two variables that is a straight line when graphed on a coordinate plane. It is an equation of the form:
y = mx + b
To calculate the amount of money Justin saves in the first month by joining the gym at the discounted price rather than the regular price, we need to know the discounted price.
The equation given is y = 15x + 20, where y represents the regular price in dollars and x represents the number of months of gym membership. However, we need to know the discounted price, which is not provided in the given information.
Once we have the discounted price, we can substitute it into the equation and calculate the savings. For example, if the discounted price is y = 10x + 20, then we can calculate the savings by subtracting the discounted price from the regular price:
Savings = Regular price - Discounted price
= (15x + 20) - (10x + 20)
= 15x - 10x
= 5x
Hence, the amount of money Justin saves in the first month would be 5 times the value of x, where x represents the number of months of gym membership, based on the discounted price provided.
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Select the proper inverse operation to check the answer to 25
-13=12
Answers
12+13 = 25, therefor the answer is correct
During a senate campaign, a volunteer passed out a "vote for roth" button. according to the catalog from which the button was ordered, it has a circumference of 25.12 centimeters. what is the button's area?
Answers
The button's area is approximately 50.27 square centimeters.
How to find the Area?To find the area of the button, we need to know the diameter of the button. We can find this by using the formula for circumference of a circle:
C = πd
where C is the circumference and d is the diameter.
Substituting the given value for C:
25.12 cm = πd
Solving for d:
d = 25.12 cm / π
d ≈ 8 cm
Now that we know the diameter, we can use the formula for area of a circle:
A = πr^2
where r is the radius (half the diameter).
Substituting the value for d:
r = d/2 = 4 cm
Substituting this value into the formula:
A = π(4 cm)^2
A ≈ 50.27 cm^2
Therefore, the button's area is approximately 50.27 square centimeters.
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A backyard fencing company charges difference prices for different amounts of fences.
The company charges $30 per foot for fences up to 300 feet and $25 per foot for fences over 300 feet.
a) Write a piecewise defined function for the cost of fencing a backyard.
Answers
The piecewise defined function for fencing the backyard would be 30(300) + 25(x - 300), if x > 300, or 30x, if 0 < x ≤ 300, as seen below.
What is a piecewise function?A piecewise defined function is a function that is defined by different formulas on different intervals or "pieces" of its domain. This means that the formula used to calculate the output (the function value) of the function depends on the value of the input (the independent variable).
For this particular question, let C be the cost of fencing a backyard and let x be the length of the fence in feet. Then, we can write the piecewise defined function as:
C(x) = 30x, if 0 < x ≤ 300 OR
C(x) = 30(300) + 25(x - 300), if x > 300
In other words, if the length of the fence is less than or equal to 300 feet, the cost is simply 30 times the length of the fence. If the length of the fence is greater than 300 feet, the cost is the cost of the first 300 feet (30 times 300), plus 25 times the additional length of the fence beyond 300 feet.
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Let functions f and g be defined over the real numbers as f(x)=x+3 and g(x) = 4x. It follows that f(g(x)) = ?
F. 12x
G. 4x+3
H. 5x+3
J. 4x² +3
K. 4x² + 12x
Answers
Answer:
I think it is k
Step-by-step explanation:
x+3(4x)
4x^2 + 12x
I am sorry if this is wrong
An isosceles triangle has legs measuring 9 feet and a base of 12 feet. Find the measure of the base angle, x, to the nearest degree
Answers
The measure of the base angle x is approximately 81.54 degrees.
To get the measure of the base angle, we can use the fact that the sum of the angles in a triangle is always 180 degrees. Since this is an isosceles triangle, we know that the two base angles are congruent (they have the same measure).
Let's call the measure of each base angle y. Then we can set up an equation:
y + y + x = 180
Simplifying, we get:
2y + x = 180
Now we can use the fact that the legs of the triangle are congruent to find the measure of y. Since this is an isosceles triangle, we know that the two legs are congruent. This means we can use the Pythagorean theorem to find the length of the height, h, of the triangle: h^2 = 9^2 - (12/2)^2
h^2 = 81 - 36
h^2 = 45
h = sqrt(45)
h = 6.71 (rounded to two decimal places)
Now we can use the definition of the tangent function to find y:
tan(y) = h / (12/2)
tan(y) = 6.71 / 6
tan(y) = 1.1183 y = tan^-1(1.1183)
y = 49.23 degrees (rounded to two decimal places)
Finally, we can substitute this value of y into our equation to find x:
2y + x = 180
2(49.23) + x = 180
98.46 + x = 180
x = 81.54 degrees (rounded to two decimal places)
Therefore, the measure of the base angle x is approximately 81.54 degrees.
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