Answers
according the given question the exact value of given expression is [tex]$\cos\frac{x}{2} = -\sqrt{\frac{1}{2(1 - \left(-\frac{160}{81}\right)^2)}} = -\sqrt{\frac{81^2}{2(81^2 - 160^2)}} = \boxed{-\frac{81\sqrt{239}}{319}}$[/tex]
First, we need to find [tex]$\sin x$[/tex] using the identity[tex]$\cos^2x + \sin^2x = 1$:$\sin^2x = 1 - \cos^2x = 1 - \left(-\frac{4}{5}\right)^2 = \frac{9}{25}$[/tex]
Since [tex]$\frac{\pi}{2} < x < \pi$[/tex], we know that [tex]$\frac{\pi}{4} < \frac{x}{2} < \frac{\pi}{2}$[/tex]. Therefore, we can use the
identity [tex]$\tan\frac{x}{2} = \frac{\sin x}{1 + \cos x}$[/tex]:
[tex]$\tan\frac{x}{2} = \frac{\sqrt{\frac{9}{25}}}{1 - \frac{4}{5}} = \frac{\frac{3}{5}}{\frac{1}{5}} = \boxed{3}$[/tex]
[tex]If $\tan x = \frac{40}{9}$ and $\pi < x < \frac{3\pi}{2}$, find $\cos\frac{x}{2}$.[/tex]
First, we need to find [tex]$\sin x$[/tex] using the identity [tex]$\tan^2x + 1 = \sec^2x$[/tex]:
[tex]$\sin x = \frac{\tan x}{\sec x} = \frac{\frac{40}{9}}{-\frac{9}{40}} = -\frac{160}{81}$[/tex]
[tex]Since $\pi < x < \frac{3\pi}{2}$, we know that $\frac{\pi}{2} < \frac{x}{2} < \frac{3\pi}{4}$[/tex]. Therefore, we can use the identity [tex]$\cos\frac{x}{2} = \pm\sqrt{\frac{1 + \cos x}{2}}$[/tex]:
[tex]$\cos\frac{x}{2} = -\sqrt{\frac{1 + \cos x}{2}} = -\sqrt{\frac{1 + \frac{\cos^2x}{\sin^2x}}{2}} = -\sqrt{\frac{\sin^2x + \cos^2x}{2\sin^2x}} = -\sqrt{\frac{1}{2(1 - \sin^2x)}}$[/tex]
Plugging in [tex]$\sin x = -\frac{160}{81}$[/tex] , we get:
[tex]$\cos\frac{x}{2} = -\sqrt{\frac{1}{2(1 - \left(-\frac{160}{81}\right)^2)}} = -\sqrt{\frac{81^2}{2(81^2 - 160^2)}} = \boxed{-\frac{81\sqrt{239}}{319}}$[/tex]
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Related Questions
Only answer this is your good at math. I don’t want to see some random kid answering this and get the answer wrong without explanation.
Question: You open a bank with a simple interest of 1.95% and your principal / p have been laying there for 30 whole years. After 30 years, you see that there is $800 in your brand account. What was the interest and what was the principal?
The Formula is I=P*R*T
interest, principal, rate, and time
Answers
Answer: To solve this problem, we can use the formula for simple interest:
I = P * r * t
where I is the interest earned, P is the principal, r is the interest rate as a decimal, and t is the time in years.
We are given that the interest rate is 1.95% = 0.0195, the time is 30 years, and the final amount in the account is $800. Let P be the principal we are trying to find.
First, we can use the formula to find the total interest earned over the 30-year period:
I = P * r * t
I = P * 0.0195 * 30
I = 0.585P
Next, we can use the fact that the final amount in the account is the sum of the principal and the interest:
800 = P + 0.585P
800 = 1.585P
P = 504.71
Therefore, the principal was $504.71 and the interest earned over the 30-year period was:
I = 0.585P
I = 0.585 * 504.71
I = 294.29
So the interest earned was $294.29.
Step-by-step explanation:
Help please I got 5.76 I don’t know if that’s right
Answers
Evaluating the linear equation in x = 19 we can see that the temperature was 5.76 degrees, so your answer is correct.
How to predict the temperature?Here we have a linear equation that relates the wind temperature with the wind's velocity.
The linear equation is:
y = -0.36*x + 12.6
Where y is the temperature and x is the wind speed. We want to find the temperature when the speed is 19 miles per hour, to get it, just replace x by 19 in the linear equation above, then we will get:
y = -0.36*19 + 12.6
y = -6.84 + 12.6
y = 5.76
So your answer is correct.
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Jacque is using a soup can for a school project and wants to paint it. If the can is 11 cm tall and has a diameter of 9 cm, at least how many square centimeters of paint is needed? Approximate using π = 3.14.
374.45 cm2
139.50 cm2
699.44 cm2
438.03 cm2
Answers
Answer:
The surface area of the soup can is given by the formula:
SA = 2πr² + 2πrh
where r is the radius of the circular ends of the can, h is the height of the can, and π is approximately 3.14.
The radius of the can is half of the diameter, so r = 4.5 cm.
Therefore, the surface area of the can is:
SA = 2π(4.5)² + 2π(4.5)(11)
SA = 2π(20.25) + 2π(49.5)
SA = 40.5π + 99π
SA = 139.5π
Approximating π as 3.14, we get:
SA ≈ 139.5 × 3.14
SA ≈ 438.03 cm²
Therefore, at least 438.03 square centimeters of paint are needed to cover the can.
So, the answer is 438.03 cm2.
I Hope This Helps!
A farmer is studying the amount of solid particles in a small pond. He determines that the average density of particles in the water is 100 milligrams per liter. The pond contains 200,000 liters of water. What is the total mass in KILOGRAMS of the particles in the pond?
(1000 milligrams = 1 gram and 1000 grams = 1 kilograms)
A.
0.2 kg
B.
20 kg
C.
200 kg
D.
20,000 kg
Answers
Answer:
Step-by-step explation: Revised 8/15. F001. Surface area of a pond, acres = Length, ft x Width, ft. 43560. F002. Volume
Suppose 50 rabbits are on Groff Farm… TRIPLING every SIX MONTHS…
How many rabbits after 5 years?
Answers
50x3=150
150x3=450
450x3=1350
1350x3=4050
4050x3=12150
Find the range of the data below
Answers
Answer:
81 is the answer
Step-by-step explanation:
87-6 range is highest and lowest number subtracted hope this helps:)
the length of a rectangle is represented by 4x + 1 and the width by 2x^2 - 3. Determine the area of the rectangle as a simplified expression in standard form
Answers
Hence, the simplified expression for the area of a rectangle in standard form is 8x³ + 2x² - 12x - 3.
In maths, what is a rectangle?Having four sides, four corners, & four right angles (90°), a rectangle is an enclosed 2-D shape. A rectangle has four equal and parallel opposite sides. Having length and width as its two dimensions, a rectangle is a two-dimensional form. The length and breadth of a rectangle are determined by its longer and shorter sides, respectively.
The equation A = length x width determines the area of a rectangle. When we replace the provided length and width expressions, we obtain:
A = (4x + 1) (2x² - 3)
By combining like terms and the distribution property of multiplication, we may make this expression simpler:
A = 8x³ - 12x + 2x² - 3
A = 8x³ + 2x² - 12x - 3
So, the area of the rectangle as a simplified expression in standard form is 8x³ + 2x² - 12x - 3.
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18.A singer sells a single as a music download and CD, making a total profit of £246.64
She sells 456 CD singles, earning 35p for every single sold.
She earns 17p for each music download of the single.
How many music downloads did she sell?
Answers
The singer sold 512 music downloads.
What is equation?A mathematical definition of an equation is a claim that two expressions are equal when they are joined by the equals sign ("="). For illustration, 2x - 5 = 13. 2x - 5 and 13 are expressions in this case. These two expressions are joined together by the sign "=".
Let's use the following variables:
CD = the number of CD singles sold
DL = the number of music downloads sold
From the problem, we know the following:
CD + DL = total number of singles sold
CD = 456
The profit from selling CD singles is 35p = £0.35 per CD single
The profit from selling music downloads is 17p = £0.17 per music download
The total profit is £246.64
Using the information above, we can set up two equations based on the profits earned from selling CD singles and music downloads:
0.35 * CD = profit from CD sales
0.17 * DL = profit from download sales
And we know that the sum of these two profits equals the total profit:
0.35 * CD + 0.17 * DL = 246.64
Substituting CD = 456, we get:
0.35 * 456 + 0.17 * DL = 246.64
Simplifying this equation, we get:
159.6 + 0.17 * DL = 246.64
0.17 * DL = 87.04
DL = 512
Therefore, the singer sold 512 music downloads.
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One angle in an isosceles triangle has a measure of 20
. Find the measure of all other angles in the triangle. List all possible values for these angles. Do not enter the degree sign, just numbers.
Answers
Answer:
the possible answers are 80 and 140
Step-by-step explanation:
since one angle has a measure of 20 in isosceles triangle let this be vertex angle and other two as base angles then
in isosceles triangle base angles must be equal to each other so
x+x+20 = 180
2x+20 = 180
2x = 160
x=80
so the base angles are equal to 80
now if you suppose 20 as base angle then other base angle should also be 20 since it is an isosceles triangle and the vertex angle can be calculated as
20+20 + x = 180
x = 140
Determine whether the statement is always true, sometimes true, or never true. Give examples. Both sides of an equation can be multiplied by the same number without changing the solution of the equation. A number can be added to both sides of an equation changing the solution of the equation.
Answers
The solution of the equation is x = 2. If we had multiplied both sides by a different number, such as 3 or -4.
What is solution of the equation ?
The solution of an equation is the value(s) of the variable(s) that make the equation a true statement. In other words, it is the value(s) that satisfy the equation.
For example, consider the equation 3x + 4 = 13. To find the solution, we need to determine the value of x that makes the equation true. the solution of the equation 3x + 4 = 13 is x = 3.
According to the question:
The first statement, "Both sides of an equation can be multiplied by the same number without changing the solution of the equation" is always true.
Example: Consider the equation 3x = 6. If we multiply both sides of this equation by 2, we get:
2 * 3x = 2 * 6
6x = 12
The solution of the equation is x = 2. If we had multiplied both sides by a different number, such as 3 or -4, we would still get the same solution.
The second statement, "A number can be added to both sides of an equation changing the solution of the equation" is sometimes true.
Example: Consider the equation 2x = 4. If we add 3 to both sides of the equation, we get:
2x + 3 = 4 + 3
2x + 3 = 7
The solution of the equation is x = 2.5. Adding 3 to both sides did not change the solution.
However, if we add a number that is equal to or related to the variable, the solution will change. For example, if we add x to both sides of the equation 2x = 4, we get:
2x + x = 4 + x
3x = 4 + x
The solution of the equation is x = 4/2 = 2, which is different from the previous solution of x = 2. Therefore, the statement "A number can be added to both sides of an equation changing the solution of the equation" is sometimes true, depending on the number being added.
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Find the probability of exactly 3 successes
in 6 trials of a binomial experiment in
which the probability of success is 75%.
P = [?]%
Answers
The prοbability οf exactly 3 successes in 6 trials οf a binοmial experiment with a prοbability οf success οf 75% is 31.1%, rοunded tο the nearest tenth οf a percent.
What is the prοbability?Prοbability is the study οf the chances οf οccurrence οf a result, which are οbtained by the ratiο between favοrable cases and pοssible cases.
Tο find the prοbability οf exactly 3 successes in 6 trials οf a binοmial experiment, we use the fοrmula:
The prοbability οf r successes in n trials is [tex]\rm _nC_r(p)^r(q)^{n-r[/tex], where p is the prοbability οf success οn a given trial and q = 1-p.
In this prοblem, n = 6, r = 3, p = q = 0.75
Sο, P(3 successes in 6 trials) = [tex]\rm _6C_3(0.75)^3(0.75)^3[/tex] = 0.13184 ≈ 13.2%
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A plane flies horizontally at an altitude of 5 km and passes directly over a tracking telescope on the ground. When the angle of elevation is /6, this angle is decreasing at a rate of /3 rad/min.
How fast is the plane traveling (in km/min) at that time? (Round your answer to two decimal places.)
Answers
Answer:
# rad u cant take 67 from it its going 35 mps
Step-by-step explanation:
Calculate the area of a square with sides of 5 inches. a. 20 inches b. 20 square inches c. 25 inches d. 25 square inches
Answers
Answer: d. 25 square inches
Step-by-step explanation:
Consider the following function.
f(x) = −2x^3 − 6x^2 + 5
(a) Use the Intermediate Value Theorem and a graphing utility to find graphically any intervals of length 1 in which the polynomial function is guaranteed to have a zero. Verify your answers by using the table feature of the graphing utility. (Select all that apply.)
(−4, −3)
(−3, −2)
(−2, −1)
(−1, 0)
(0, 1)
(1, 2)
(2, 3)
(3, 4)
(b) Use the zero or root feature of the graphing utility to approximate the real zeros of the function. (Enter your answers as a comma-separated list. Round your answers to three decimal places.)
x =
Answers
, in the presented question, we can conclude that Interval [tex](0, 1): f(0) 5, f(1) -3[/tex], indicating that the function switches signs and has a zero in the interval [tex](0, 1).[/tex]
What are polynomials?Interval [tex](4, 3): f(-4) -41, f(-3) 5,[/tex]therefore, the function reverses its sign and has a zero in the interval [tex](-4, -3).[/tex]
Interval [tex](3, 2): f(-3) 5, f(-2) -9,[/tex] indicating that the function changes sign and has a zero in the interval [tex](-3, -2).[/tex]
Interval [tex](2, 1): f(-2) -9, f(-1) 1[/tex], therefore the function reverses its sign and has a zero in the interval [tex](-€2, -1).[/tex]
Interval [tex](1, 0): f(-1) 1, f(0) 5[/tex], so the function does not change sign and the interval may or may not contain a zero [tex](-1, 0).[/tex]
Interval [tex](0, 1): f(0) 5, f(1) -3,[/tex] indicating that the function switches signs and has a zero in the interval [tex](0, 1).[/tex]
Therefore, in the presented question, we can conclude that Interval [tex](0, 1): f(0) 5, f(1) -3[/tex], indicating that the function switches signs and has a zero in the interval [tex](0, 1).[/tex]
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4x+8y+2 in y
intercept form
Answers
Answer:
e
Step-by-step explanation:
What is the area of this trapezoid?
Answers
Answer:
8*7=56 + 8*3=24 = 80_squared
Step-by-step explanation:
PLEASE HELP Area of Cross Sections
Answers
Answer:
396 in²
Step-by-step explanation:
To answer this question we need to use pythagorean theorem (a² + b² = c²)
In our case, a would be 14 and b would be 17
14² + 17² = ?²196 + 289 = 485[tex]\sqrt{485}[/tex] = 22.02Now we have to multiply this by 18
22.02 x 18 = 396.36Which rounded would be 396
Hope this helps, have a lovely day! :)
Please help me with my trig hw
Answers
I have a barn that is a regular hexagon, as shown. Each side of the barn is 100 feet long. I tether my burro to point A with a 150 foot rope. Find the area of the region in which my burro can graze. Round your answer to nearest foot squared.
Answers
The area of the region in which the burro can graze will be 833 pi square feet.
What is the value of the area?Each interior vertex angle of a regular hexagon is (n - 2)·180°/n = (6 - 2)·180°o/6 = 120°
I'll break up the area into three sections.
There is one major section, going 150' along one side in a circular arc to 150' along the adjacent side.
Since the interior angle is 120°, the exterior angle will be 240°.
The area of this section will be: (240°/360°)·pi·radius2 = (2/3)·pi·1502 = 15,000 pi
Then, on each end, around the corner of the barn, the goat can go in a circular arc with radius = 50'.
This angle will be 60°, or one-sixth or a circle.
The area of each section will be (1/6)·pi·502 = 416 2/3 pi
Total area: 15,000 pi + 416 2/3 pi + 416 2/3 pi = 833 1/3 pi square feet.
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Solve for x.
x + 5
30
36
20
Answers
CUAL ES EL CONJUNTO DE SOLUCIONES DE LA ECUACION X^2+3X-4=6
Answers
The solution set of the equation x^2+3x-4=6 is {-5, 2}.
The answer of the given question are as follows :-
Para encontrar el conjunto de soluciones de la ecuación x^2+3x-4=6, debemos primero llevarla a su forma canónica. Restando 6 de ambos lados, obtenemos:
x^2+3x-10=0
Luego, podemos resolver esta ecuación utilizando la fórmula cuadrática:
x = (-b ± sqrt(b^2 - 4ac)) / 2a
donde a = 1, b = 3, y c = -10.
Reemplazando estos valores, obtenemos:
x = (-3 ± sqrt(3^2 - 4(1)(-10))) / 2(1)
x = (-3 ± sqrt(49)) / 2
x = (-3 ± 7) / 2
x1 = 2
x2 = -5
Por lo tanto, el conjunto de soluciones de la ecuación x^2+3x-4=6 es {-5, 2}.
Translation in english :-
To find the solution set of the equation x^2+3x-4=6, we must first bring it to its standard form. Subtracting 6 from both sides, we get:
x^2+3x-10=0
Then, we can solve this equation using the quadratic formula:
x = (-b ± sqrt(b^2 - 4ac)) / 2a
where a = 1, b = 3, and c = -10.
Substituting these values, we get:
x = (-3 ± sqrt(3^2 - 4(1)(-10))) / 2(1)
x = (-3 ± sqrt(49)) / 2
x = (-3 ± 7) / 2
x1 = 2
x2 = -5
Therefore, the solution set of the equation x^2+3x-4=6 is {-5, 2}.
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What is the volume of this cone?
Answers
The volume of the cone is 2119. 5 cubic centimeters
How to determine the volume of the coneThe formula used for calculating the volume of a cone is expressed as;
V = πr² h/3
Given that the parameters are namely;
V is the volume of the cone.π takes the constant value of 3.14h is the height of the cone.r is the radius of the cone.Now, substitute the values, we have;
Volume , V = 3.14 × 15² × 9/3
Divide the values, we have;
Volume = 3.14 × 225 × 3
Multiply the values, we get;
Volume, V = 2119. 5 cubic centimeters
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i have an upcoming exam
I need help with inequalities
can someone give me problems then put the answers below?
Thanks
Please at least 5
Reward- Brainliest and 25 Tokens
Answers
Problems:
Solve for x: 2x - 5 > 9x + 2
Solve for x: 3x + 2 < 7x - 5
Solve for x: 4x + 3 < 2x - 1
Solve for x: -2x - 4 > -8x + 3
Solve for x: 5x + 1 < 2x + 7
Answers:
x < -0.7
x > 1.75
x < -1
x < 0.875
x < 1.2
Answer:
Example 1
Solve 3x − 5 ≤ 3 − x.
Solution
We start by adding both sides of the inequality by 5
3x – 5 + 5 ≤ 3 + 5 − x
3x ≤ 8 – x
Then add both sides by x.
3x + x ≤ 8 – x + x
4x ≤ 8
Finally, divide both sides of the inequality by 4 to get;
x ≤ 2
Example 2
Calculate the range of values of y, which satisfies the inequality: y − 4 < 2y + 5.
Solution
Add both sides of the inequality by 4.
y – 4 + 4 < 2y + 5 + 4
y < 2y + 9
Subtract both sides by 2y.
y – 2y < 2y – 2y + 9
Y < 9 Multiply both sides of the inequality by −1 and change the inequality symbol’s direction. y > − 9
Solving linear inequalities with subtraction
Let’s see a few examples below to understand this concept.
Example 3
Solve x + 8 > 5.
Solution
Isolate the variable x by subtracting 8 from both sides of the inequality.
x + 8 – 8 > 5 – 8 => x > −3
Therefore, x > −3.
Example 4
Solve 5x + 10 > 3x + 24.
Solution
Subtract 10 from both sides of the inequality.
5x + 10 – 10 > 3x + 24 – 10
5x > 3x + 14.
Now we subtract both sides of the inequality by 3x.
5x – 3x > 3x – 3x + 14
2x > 14
x > 7
Solving linear inequalities with multiplication
Let’s see a few examples below to understand this concept.
Example 5
Solve x/4 > 5
Solution:
Multiply both sides of an inequality by the denominator of the fraction
4(x/4) > 5 x 4
x > 20
Step-by-step explanation:
Hope this helps :3
what is a prime number
Answers
Answer: A prime number is a positive integer greater than 1 that has no positive integer divisors other than 1 and itself. In other words, a prime number is a number that is only divisible by 1 and itself.
Step-by-step explanation:
For example, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, and so on, are prime numbers because they can only be divided by 1 and themselves without any remainder.
However, 4 is not a prime number because it can be divided by 1, 2, and 4, and 6 is not a prime number because it can be divided by 1, 2, 3, and 6.
Answer:
A prime number is a number that can be multiplied by one and itself~
eg- 2,3,5,7,11
Let me know if this helps
A store had 869 swimsuits that were marked to sell at $45.95. Each suit was marked down $17.90. Find the reduced price using the formula M=S-N, where M is the mark down, S is the original selling price, and N is the reduced price.
Answers
The reduced price of the swimsuit is $28.05 being obtained by using the mark down value and selling price of the product.
Explain Pricing?
A price technique that allows for discussion between the supplier and the buyer is flexible pricing. The supplier does not provide a fixed price while using this tactic. They decide on a price range in advance so that they can haggle with the customer. A vendor will have a minimum number they can take and a maximum number they may charge when using flexible pricing.
Using the formula M=S-N, where M is the mark down, S is the original selling price, and N is the reduced price, we can find the reduced price of each swimsuit as follows:
M = $17.90
S = $45.95
N = S - M
N = $45.95 - $17.90
N = $28.05
Therefore, the reduced price of each swimsuit is $28.05.
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Solve for the tangent line of cos(x) at x= pi/4. Use the tangent line to estimate the value of cos(48).
Answers
The estimated value of cos(48) by using tangent line is found to be
0.99989.
Explain about the tangent line ?A straight line which thus touches a function only once is called a tangent line.
The first step is to calculate y when x=π/4. We will receive that target coordinate point as a result.
The required coordinate point is ( π/ 4, √(2) / 2)
The derivative of such function y is then discovered.
y ' = -sin(x)
Input the derivative with the value of x. This corresponds to the tangent line's slope.
y' = -sin(π/4)
y' = - √(2) / 2
The slope plus coordinate point are now entered into the gradient intercept form of the formula to obtain b.
y = mx + b
√(2) / 2 = (-√(2) / 2)(π / 4) + b
√(2) / 2 = (-π√(2) / 8) + b
(√(2) / 2) + (π√(2) / 8) = b
[4√(2) + π√(2)] / 8 = b
[(4 + π)√(2)] / 8 = b
The tangent line comes out to be:
y = (-√(2) / 2)x + [(4 + π)√(2) / 8]
Now , for cos(48).
48° = π/180 * 48 radians
48° = 3.14/180 * 48 radians
48° = 0.01744*48 radians
48° = 0.83712 radians
So, cos(48) = cos( 0.83712 )
Using scientific calculator:
cos(48) = cos( 0.83712 ) = 0.99989
Thus, the estimated value of cos(48) by using tangent line is found to be
0.99989.
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i need help with my geometry work please . giving 45 points !!!
Answers
If f(x)= 4x/x-3
then determine the value of f^-1 (inverse) (16) Explain or show how you arrived at your answer.
Answers
Answer:32+ 1.21
Step-by-step explanation:
if you really want an awser you would take all the nubers and sfhgkjfqipjghwpkrejvhbwptijgbqkejnvwpigtnjuvrepiufgnjwrekjbhartio
there are 250 n each has a mass of 5.2x10 to the negative 3 power kilograms.What is the total mass in kilograms in decimal form
Answers
Answer:
the total mass of the 250 objects is 1.3 kilograms.
Step-by-step explanation:
To find the total mass of the 250 objects, we need to multiply the mass of each object by the number of objects:
Total mass = mass per object x number of objects
The mass per object is given as 5.2x10^-3 kg, and the number of objects is 250. So, we can calculate the total mass as follows:
Total mass = 5.2x10^-3 kg x 250
Total mass = 1.3 kg
15. MULTIPLE CHOICE Determine which statement is true given that CBX = SML.
Answers
The statement that is true, given that ΔCBX ≅ ΔSML, would be G. XC ≅ ML.
How to find the true statement on congruent triangles ?Given that ΔCBX ≅ ΔSML, we can use the properties of congruent triangles to determine which statement is true. The correspondence between the vertices of the two triangles is as follows:
C ↔ S
B ↔ M
X ↔ L
XC ≅ ML is true because XC corresponds to the side connecting vertices X and C in ΔCBX, and ML corresponds to the side connecting vertices M and L in ΔSML. Since the triangles are congruent, their corresponding sides are congruent.
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