577 square feet is the area of the painted part of the wall.
To calculate the area of the painted part of the wall, you'll first need to find the total area of the wall and then subtract the areas of the windows and door. Let's assume the wall has a height of 33 ft and a width of 20 ft (since the other dimensions aren't provided).
1. Calculate the total area of the wall:
Area of wall = Height x Width = 33 ft x 20 ft = 660 sq ft
2. Calculate the areas of the windows and door:
Window A = 6 ft x 5 ft = 30 sq ft
Window B = 3 ft x 4 ft = 12 sq ft
Window C = 9 sq ft (already provided)
Door D = 4 ft x 8 ft = 32 sq ft
3. Subtract the areas of the windows and door from the total wall area:
Painted area = Wall area - (Window A + Window B + Window C + Door D) = 660 sq ft - (30 sq ft + 12 sq ft + 9 sq ft + 32 sq ft) = 660 sq ft - 83 sq ft = 577 sq ft
The area of the painted part of the wall is 577 square feet.
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HELP ME UNDERSTAND THIS
The estimated areas of each curve are listed below:
Case 1: A = 12.75
Case 2: A = 12.5
How to estimate the area of the function by use of rectangles and triangles
In this problem we must estimate the area above the x-axis and under a curve by using sums of rectangles and triangles according to the following expression:
A = {∑ [MIN (f(xₙ₋₁), f(xₙ))] + 0.5 · ∑ [MAX (f(xₙ₋₁), f(xₙ)) - MIN (f(xₙ₋₁), f(xₙ))]} · Δx, for n = {1, 2, 3, ..., N}
Where:
A - AreaN - Number of blocks.Case 1
A = (3.5 + 3.5 + 1.5) · 1 + 0.5 · (3.5 + 0.75 + 0.75 + 2 + 1.5) · 1
A = 8.5 + 0.5 · 8.5
A = 12.75
Case 2
A = (1 + 3 + 4) · 1 + 0.5 · (1 + 2 + 1.5 + 0.5 + 4) · 1
A = 8 + 4.5
A = 12.5
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A quantitative data set has mean 25 and standard deviation 2. At least what percentage of the observations lie between 19 and 31 ?
At least 95% of the observations lie between 19 and 31.
To see why, we can use Chebyshev's theorem, which states that for any data set, regardless of the shape of the distribution, at least 1 - (1/k²) of the observations lie within k standard deviations of the mean. In this case,
we want to know the percentage of observations that lie within two standard deviations of the mean, since 19 and 31 are both two standard deviations away from the mean of 25.
So, we can use k = 2 in Chebyshev's theorem, which gives us:
1 - (1/2²) = 1 - (1/4) = 0.75
Therefore, at least 75% of the observations lie within two standard deviations of the mean. However, since we know the data set is normally distributed (since we know the mean and standard deviation), we can use the empirical rule,
which states that for normally distributed data, approximately 68% of the observations lie within one standard deviation of the mean, and approximately 95% of the observations lie within two standard deviations of the mean.
Therefore, we can conclude that at least 95% of the observations lie between 19 and 31.
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Josh lit a 14-inch candle. She noticed that it was getting an inch shorter every 30 minutes. Let x be the number of hours and y be the total height of the candle
The height of the candle after x hours is given by the equation y = 2x + 14.
Let's first convert the time interval to hours. There are 60 minutes in an hour, so 30 minutes is equivalent to 0.5 hours.
After x hours, the candle will have burned down by 2x inches (since it burns 1 inch every 0.5 hours).
If y is the total height of the candle, then we can write the equation:
y - 2x = 14
We can solve for y:
y = 2x + 14
So the height of the candle after x hours is given by the equation y = 2x + 14.
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the asq (american society for quality) regularly conducts a salary survey of its membership, primarily quality management professionals. based on the most recently published mean and standard deviation, a quality control specialist calculated the z-score associated with his own salary and found it was -2.50. this tells him that his salary is
This tells him that his salary is significantly below the average salary of quality management professionals surveyed by the ASQ, and that he is in the bottom percentile of salaries in this group.
The z-score is a statistical measure that indicates the number of standard deviations that a data point is from the mean of a distribution. A negative z-score indicates that the data point is below the mean.
In this case, the quality control specialist's z-score of -2.50 indicates that his salary is 2.50 standard deviations below the mean salary of the quality management professionals surveyed by the ASQ.
Without knowing the specific mean and standard deviation provided by the survey, it is difficult to determine the exact value of the specialist's salary. However, we can use the z-score to estimate the percentile rank of his salary compared to the rest of the survey respondents.
Using a standard normal distribution table, we can see that a z-score of -2.50 corresponds to a percentile rank of approximately 0.0062 or 0.62%. This means that only about 0.62% of quality management professionals surveyed by the ASQ earn a salary lower than that of the quality control specialist.
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1. Paula has x cups of food in a container to feed her dogs. She pours 1. 5 cups of food into their bowls. There is now 5. 25 cups left in the container. Which equation would be used to solve this problem?
a. 1. 5 - x = 5. 25
b. 5. 25 - x = 1. 25
c. X - 1. 5= 5. 25
d. X + 1. 5= 5. 25
2. A box of donuts cost $9. You want to send donuts to the local nursing home. Set up an equation to find how many boxes you can send if you have $72.
a. 72 = 9 + b
b. 72 = 9 - b
c. 72 = 9b
d. 72 = 9/b
3. Jordan is purchasing a board to build a bookcase. He wants to divide the board into 1. 75 foot sections and he needs 6 sections. Which equation can be used to solve this problem?
a. B/1. 75 = 6
b. 1. 75b = 6
c. B - 1. 75 = 6
d. B + 1. 75 = 6
The correct option for each individual question is c. X - 1. 5= 5. 25, c. 72 = 9b and B/1.75 = 6.
1. Total food = poured food + remaining food
Keep the values in formula
x = 1.5 + 5.25
Rearranging the equation
x - 1.5 = 5.25
Thus, correct option is c. X - 1. 5= 5. 25
2. Cost of one box × number of boxes = total cost
9 × number of boxes = 72
Let us represent the number of boxes as b. So,
9b = 72
Hence, correct option is c. 72 = 9b.
3. Length of each section × number of sections = total length of bookcase sections
Let us represent total length of bookcase sections as B
1.75 × 6 = B
Rearranging the equation
B/1.75 = 6
So, the correct option is a. B/1. 75 = 6.
Thus, correct option are c. X - 1. 5= 5. 25, c. 72 = 9b and B/1.75 = 6.
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Information into an equation and solve the
equation
The sum of a number n and 11 is equal to 25. Find the number n
The resultant equation is n + 11 = 25 and the number n is 14.
Algebraic equation:
An algebraic equation is a mathematical statement that equates two expressions using one or more variables. Solving a single variable equation can be done by adding or subtracting the same integer on both sides. Similarly multiplying or dividing by the same integer.
The information we have
The sum of a number n and 11 is equal to 25.
The statement can represent an equation and solve for n as follows
Here sum of two numbers indicates adding
Hence, n + 11 = 25
To solve for n, isolate n on one side of the equation.
This can be done by subtracting 11 from both sides of the equation:
=> n + 11 - 11 = 25 - 11
=> n = 14
Therefore,
The resultant equation is n + 11 = 25 and the number n is 14.
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Is Y= 4x^3+6....
A. Linear
B. Nonlinear
C. Both
D. Neither
Answer:
The given equation Y=4x^3+6 is a nonlinear equation because it contains a term with a power of 3, which means that the relationship between Y and x is not linear. In a linear equation, the power of the variable is always 1. Therefore, the answer is B. Nonlinear.
Step-by-step explanation:
How go i get the probability
The probability that we want to get is 0.167
How to find the probability?To get this probability, we need to take the quotient between the number of students that preffers athletics and literature and the total number of students in the table.
We have:
Total number = 5 + 3 + 2 +8 = 18
number that preffers athletics and literature = 3
Then the probability is:
P = 3/18 = 0.167
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Each theme park charges an entrance fee plus an additional fee per ride. Write a function for each park. (3 points)
a) write a function rule for Big Wave Waterpark
b) write a function rule for Coaster City
c) write a function rule for Virtual Reality Lan
Answer:
a)
[tex]m = \frac{15 - 10}{4 - 2} = \frac{5}{2} [/tex]
[tex]10 = \frac{5}{2} (2) + b[/tex]
[tex]10 = 5 + b[/tex]
[tex]b = 5[/tex]
[tex]y = \frac{5}{2}x + 5[/tex]
b) The function is already given.
c)
[tex]m = \frac{100 - 40}{30 - 10} = \frac{60}{20} = 3 [/tex]
[tex]100 = 3 (30) + b[/tex]
[tex]100 = 90 + b[/tex]
[tex]b = 10[/tex]
[tex] y = 3x + 10[/tex]
simple interest earned for principal of $2000 at and 8% rate for 5 years
Simple Interest is equal to ($800) (2000 x 8 x 5) / 100. The simple interest earned is therefore $800.
What is interest?The measure of cash returned or earned over a set period of time on a principal sum of money is referred to as interest. It is frequently stated as a share of the principal sum and it may be either simple or complicated. Compounding interest is computed on the principal amount as well as any accrued but unpaid interest, whereas simple interest is assessed just on the principal amount. Loans, investments, and bank deposits frequently include interest.
given
We can use the following calculation to determine the simple interest received for a $2000 principal at an 8% rate over a 5-year period:
S.I = (Principal x Rate x Time)/100
In this instance, Principal is $2000, Rate is 8% annually, and Term is 5 years.
With these values entered into the formula, we obtain:
Simple Interest is equal to ($800) (2000 x 8 x 5) / 100. The simple interest earned is therefore $800.
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Keshia is working on a math worksheet with 50 problems she has completed 20 problems in 25 mins if she continue at this pace what will be her total time for her compete worksheet
It will take Keshia 62.5 minutes to complete the entire worksheet at the same pace.
To find the amount of total time it will take Keshia to complete the entire worksheet at the same pace, we can use a proportion:
20 problems / 25 minutes = 50 problems / x minutes
To solve for x, we can cross-multiply and simplify:
20 problems * x minutes = 25 minutes * 50 problems
20x = 1250
x = 1250 / 20
x = 62.5
Therefore, it will take Keshia 62.5 minutes to complete the entire worksheet at the same pace.
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Yesterday, of the coffee shop's customers ordered flavored coffee. of the
orders were for chocolate flavored coffee. What part of the coffee shop's
customers ordered chocolate flavored coffee?
67
56
14
Part A: An angle is two collinear rays with a common endpoint Find an example that contradicts this definition How would you change the delito
accurate? (5 points)
Part B: Give an example of an undefined term and how it pertains to angles (5 points)
PLEASE HELP ME !!
Part A: The given definition states that an angle is two collinear rays with a common endpoint. Part B : A point is an example of an undefined term.In relation to angles, a point is crucial as it serves as the common endpoint of the two rays that form the angle.
Part A : The given definition states that an angle is two collinear rays with a common endpoint. However, this definition is incorrect as it contradicts the correct definition of an angle. In the correct definition, an angle is formed by two non-collinear rays with a common endpoint.
An example that contradicts the given definition is when you have two rays, AB and BC, with B being the common endpoint. If they were collinear, they would lie along the same straight line, and thus, no angle would be formed between them. To make the definition accurate, you would need to change it to: "An angle is formed by two non-collinear rays with a common endpoint."
Part B: An undefined term in geometry is a term that cannot be defined using other known geometric terms, but its meaning is generally understood. One example of an undefined term is a point. A point is a basic element in geometry, and it has no size, shape, or dimensions. It is merely a location in space. For instance, when discussing angle ABC, point B is the common endpoint of rays AB and BC.
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Marcia drew a plan for a rectangular piece of material that she will use for a blanket. Three of the vertices are (-1.3, -3.5), (-1.3, 1.4), and (3.9,1.4) . What are the coordinates of the fourth vertex?
The coordinates of the fourth vertex is (3.9, 6.3,0).To find the coordinates of the fourth vertex, we can use the fact that opposite sides of a rectangle are parallel and equal in length.
We can find the length and slope of one side of the rectangle and then use that information to find the coordinates of the fourth vertex.
Let's start by finding the length and slope of the side connecting (-1.3, -3.5) and (-1.3, 1.4). The length of this side is the difference between the y-coordinates, which is:
1.4 - (-3.5) = 4.9
Since this side is vertical, its slope is undefined.
Next, let's find the length and slope of the side connecting (-1.3, 1.4) and (3.9, 1.4). The length of this side is the difference between the x-coordinates, which is:
3.9 - (-1.3) = 5.2
Since this side is horizontal, its slope is 0.
Since opposite sides of a rectangle are equal in length, the length of the side connecting (-1.3, 1.4) and (3.9, 1.4) must also be 4.9. We can use this length to find the y-coordinate of the fourth vertex, which is:
1.4 + 4.9 = 6.3
Now we know that the fourth vertex has coordinates (x, 6.3). To find the x-coordinate, we can use the length of the vertical side connecting (-1.3, -3.5) and (-1.3, 1.4), which is also 5.2. The x-coordinate of the fourth vertex is:
-1.3 + 5.2 = 3.9
Therefore, the coordinates of the fourth vertex are (3.9, 6.3,0).
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A garden bed is 4’ by 3’ and a 6’ layer of soil will be spread over the garden. A bag of soil contains 2ft3 of soil how many bags r needed
36 bags of soil are required to spread a 6 feet layer over a garden bed that is 4 feet by 3 feet.
How many bags of soil are required to spread a 4 feet layer over the garden bed?Given information:
The garden bed has a length of 4 feet.
The garden bed has a width of 3 feet.
The layer of soil to be spread over the garden bed is 6 feet.
One bag of soil contains 2 cubic feet of soil.
To find the number of bags of soil required to spread a 6 feet layer over the garden bed, we need to calculate the volume of soil needed and then divide it by the volume of each bag of soil.
The volume of soil needed can be calculated by multiplying the length, width, and height (depth) of the soil:
Volume = length x width x depth
Volume = 4 feet x 3 feet x 6 feet
Volume = 72 cubic feet
This means we need a total of 72 cubic feet of soil to spread a 6 feet layer over the garden bed.
Next, we need to determine the number of bags of soil required. Since each bag contains 2 cubic feet of soil, we can divide the total volume of soil needed by the volume of each bag to get the number of bags required:
Number of bags = Volume of soil needed / Volume of each bag
Number of bags = 72 cubic feet / 2 cubic feet per bag
Number of bags = 36 bags
Therefore, 36 bags of soil are required to spread a 6 feet layer over a garden bed that is 4 feet by 3 feet.
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17 Question Evaluate y=−4(5)x y = − 4 ( 5 ) x for x
The equation y=−4(5)x y = − 4 ( 5 ) x can be simplified to y = -20x. This equation is a linear function with a slope of -20. As x increases, y decreases at a rate of 20 units for every one unit increase in x. Therefore, the value of y will decrease rapidly as x increases.
The Worthington Family is applying for a loan to purchase a new home. In order to qualify they
must have a net worth greater than $100,000.
• Mr. Worthington is a dentist, so he has $85,400 in student loans to pay off.
•Mrs. Worthington earns $42,500 per year at her job.
•The Worthington family has a savings account with a balance of $18,800.
•They own two vehicles that are worth a combined total of $64,600.
• Mrs. Worthington owns an antique necklace valued at $6,200.
"Run.
• The Worthingtons have been saving for their children's college fund.
currently has a balance of $24,700
The net worth of the Worthington family is $28,900, which is greater than the requirement of $100,000 for the loan. Therefore, they meet the net worth requirement for the loan.
To calculate the net worth of the Worthington family, we need to add up all their assets and subtract their liabilities (debts). Let's start by listing them:
Assets:
- Savings account: $18,800
- Vehicles: $64,600
- Antique necklace: $6,200
- College fund: $24,700
Total assets: $114,300
Liabilities:
- Mr. Worthington's student loans: $85,400
Total liabilities: $85,400
To calculate the net worth, we subtract the liabilities from the assets:
Net worth = Total assets - Total liabilities
Net worth = $114,300 - $85,400
Net worth = $28,900
The net worth of the Worthington family is $28,900, which is greater than the requirement of $100,000 for the loan. Therefore, they meet the net worth requirement for the loan.
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Find a formula for the slope of the graph of fat the point (x, f(x)). Then use it to find the slope at the two given points.
a. The formula for the slope at (x, f(x)) is f'(x) = -2x
b. The slope at (0, 8) is 0
c. the slope at (-1, 7) is 2
What is the slope of a graph?The slope of a graph is the gradient of the graph.
Given the graph f(x) = 8 - x² to find the formula for the slope of the graph, we proceeed as follow.
a. To find the formula for the slope of the graph, we know thta the slope of the graph is the derivative of the graph. So, taking the derivative of the graph, we have that
f(x) = 8 - x²
df(x)/dx = d(8 - x²)/dx
= d8/dx - dx²/dx
= 0 - 2x
= -2x
So, the formula for the slope at (x, f(x) is f'(x) = -2x
b. To find the slope at (0, 8), substituting x = 0 into the equation for the slope, we have that
f'(x) = -2x
f'(0) = -2(0)
= 0
So, the slope at (0, 8) is 0
c. To find the slope at (-1, 7), substituting x = -1 into the equation for the slope, we have that
f'(x) = -2x
f'(0) = -2(-1)
= 2
So, the slope at (-1, 7) is 2
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Write a derivative formula for the function.
f(x) = 2x√7x+8 + 96
The derivative formula of the given function f(x) is:
f'(x) = 2√(7x+8) + 7x/(√(7x+8))
This formula gives the value of the derivative of the function f(x) for any value of x.
How we find derivative?The derivative of f(x) using the product rule and chain rule:
f'(x) = 2√(7x+8) + 2x(1/2)(7x+8)^(-1/2)(7)
f'(x) = 2√(7x+8) + 7x/(√(7x+8))
Simplify the derivative
The derivative of the function f(x) is given by f'(x) = 2√(7x+8) + 7x/(√(7x+8))
In this formula, the first term represents the derivative of the function 2x√(7x+8) using the chain rule, and the second term represents the derivative of the function 96, which is a constant and has a derivative of zero.
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The total municipal debt for the state of Illinois can be represented as the exponential function M (t) = 41. 24(1. 052)^t
where M represents the total municipal debt for the state in billions of dollars and t is the number of years since 2000
Determine the statement that interprets the function M (t).
A) The total municipal debt in Illinois was $41. 24 million in 2000 and increases about 1. 052% each year.
B) The total municipal debt in Illinois was $43. 38 billion in 2000 and increases about 5. 2% each year.
C) The total municipal debt in Illinois was $39. 20 billion in 2000 and increases about 105. 2% each year.
D)The total municipal debt in inois was $41. 24 billion in 2000 and increases about 5. 2% each year
The correct statement that interprets the function M(t) is:
B) The total municipal debt in llinois was $43.38 billion in 2000 and increases about 5.2% each year.
According to the question the function M(t) =41.24(1.052)^t represents the total municipal debt for the state of llinois in billions of dollars, where t is the number of years since 2000.
The incorrect options are:
Option A is incorrect as the function does not represent an increase of 1.052% each year, but rather an increase of 5.2% each year (since 1.052=1+0.052)
Option C is also incorrect because it suggests an increase of 105.2% each year, which is not possible.
Option D is also incorrect because it states that the total municipal debt was $41.24 billion in 2000, and increases about 5.2% each year.
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naproxen 375 mg PO daily. If each scored tablet contains 250 mg,
how many tablets will you administer?
To administer a daily dose of 375 mg of naproxen using 250 mg scored tablets, the patient would need to take 1.5 tablets, rounded up to 2 tablets of 250 mg each.
To administer 375 mg of naproxen using 250 mg scored tablets, we need to divide 375 by 250 to determine how many tablets to administer.
375 mg / 250 mg per tablet = 1.5 tablets
Therefore, the dosage of 375 mg of naproxen would require 1.5 tablets.
Since tablets cannot be divided into halves, the patient would need to take 2 tablets of 250 mg each to achieve the prescribed dosage of 375 mg.
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what is 7 + 9d = 7d +3?
Answer:
-2
Step-by-step explanation:
7+9d=7d+3
7+2d=3
2d=-4
d=-2
Graph the line that represents a proportional relationship between ddd and ttt with the property that an increase of 333 units in ttt corresponds to an increase of 444 units in ddd.
What is the unit rate of change of ddd with respect to ttt? (That is, a change of 111 unit in ttt will correspond to a change of how many units in ddd?)
The unit rate is
.
Graph the relationship.
The unit rate of change of ddd with respect to ttt is 4/3.
To graph the proportional relationship between ddd and ttt, we first need to find the unit rate of change. Since an increase of 333 units in ttt corresponds to an increase of 444 units in ddd, we can calculate the unit rate as follows:
Unit Rate = (Change in ddd) / (Change in ttt) = 444 / 333 = 4/3
So, a change of 1 unit in ttt corresponds to a change of 4/3 units in ddd.
Now, let's graph the relationship. The equation representing this proportional relationship is:
ddd = (4/3)ttt
This is a linear relationship with a slope of 4/3 and passes through the origin (0,0). To plot the graph, start at the origin and use the slope to plot additional points, such as:
- For ttt = 3, ddd = 4 (since 4/3 * 3 = 4)
- For ttt = 6, ddd = 8 (since 4/3 * 6 = 8)
Plot these points and draw a straight line through them, representing the proportional relationship between ddd and ttt. The unit rate of change of ddd with respect to ttt is 4/3.
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Graph the following system of equations.
x + 2y = 6
2x + 4y = 12
What is the solution to the system?
There is no solution.
There is one unique solution, (6, 0).
There is one unique solution, (0, 3).
There are infinitely many solutions.
The solution to the system of equations shown above is: D. there are infinitely many solutions.
How to graphically solve this system of equations?In order to determine the solution for this system of linear equations on a coordinate plane, we would make use of an online graphing calculator to plot the given system of linear equations while taking note of the point of intersection;
x + 2y = 6 ......equation 1.
2x + 4y = 12 ......equation 2.
Based on the graph shown (see attachment), we can logically deduce that the solution for this system of linear equations is the point of intersection of each lines on the graph that represents them, which is given by multiple ordered pairs and as such, it has more than one solution or infinitely many solutions because the lines coincide.
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Gas prices are on the rise this summer as more Americans travel, Prices have increased by 40% from last summer's price, which averaged $2. 26 per gallon. Jonah's mom's car takes 14 1/2 gallons of gas to fill up. Find the cost that Jonah's mom would have to spend after the 40% increase in gas prices if she fills up her tank the entire 14 1/2 gallons.
Jonah's mom's would have to spend $45.878 to fill up her tank after the 40% increase in gas prices if her car takes 14 1/2 gallons of gas to fill up.
To find the cost that Jonah's mom would have to spend after the 40% increase in gas prices to fill up her 14 1/2 gallon tank, we need to follow these steps:
1. Find the increased price per gallon by multiplying last summer's price ($2.26) by 1.40 (since there's a 40% increase): $2.26 x 1.40 = $3.164 per gallon.
2. Convert 14 1/2 gallons to a decimal: 14.5 gallons.
3. Multiply the increased price per gallon ($3.164) by the number of gallons needed to fill up the tank (14.5 gallons): $3.164 x 14.5 = $45.878.
So, after the 40% increase in gas prices, Jonah's mom would have to spend $45.878 to fill up her 14 1/2 gallon tank.
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please i need answer to this Asap. Only question A, B, C, E . With solution Asap
Answer:
Solve for these and you'll find it! :D (Surface Area for all)
The answer is:
A: 6(12)^2 (it's a cube)
B: 2(6.4 x 15.2 + 15.2 x 10.5 + 6.4 x 10.5) (it's a rectangular prism)
C: 6(3x - 1)^2 (it's a cube)
D: 2(pi)(radius)(height) + 2(pi)(radius^2) (it's a cylinder)
Michael had 8/9 of a spool of yarn. He used 2/5 of his yarn for a project. What fraction of the spool was used for the project?
Answer:16/45 of his yarn
Step-by-step explanation:
8/9 x 2/5 = 16/45
Circle Q has a diameter AB. If the distinct point C is also on the circle then triangle ABC must be
If point C is on the circle with diameter AB, then triangle ABC must be a right triangle. This is because the diameter of a circle is the longest chord and it passes through the center of the circle.
If we draw a line from point C to the center of the circle (which is the midpoint of AB), we get a perpendicular bisector of AB, meaning that it cuts AB into two equal parts and forms right angles with it. This also means that AC and BC are equal in length (since they both form radii of the circle), and the angle at point C must be a right angle (since it forms a straight line with the center of the circle). Thus, triangle ABC satisfies the criteria for a right triangle.
In summary, if point C lies on the circle with diameter AB, then triangle ABC must be a right triangle with AC and BC as its legs and AB as its hypotenuse. This is a fundamental property of circles and right triangles, and it is important to understand in order to solve various geometry problems involving circles and triangles.
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A researcher is 95% confident that the interval from 3. 6 hours to 8. 1 hours captures y = the true mean amount of daily
screen time for US adults.
Is there evidence that the true mean number of hours of screen time for US adults is greater than 3. 5?
For the given case, there is evidence that the true mean number of hours of screen time for US adults is greater than 3.5.
Here, the researcher is 95% confidence interval from 3.6 hours to 8.1 hours captures y = the true mean amount of daily screen time for US adults.
If 3.5 hours falls below this interval, it is likely that the true mean number of hours of screen time for US adults is greater than 3.5 hours.
A confidence interval is a measure of values that is used to evaluate a statistical parameter which tends to involve the true form of the parameter a predetermined proportion of the time if the procedure of searching the group of values is repeated numerous times.
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A circle in the xy-coordinate plane has the equation
�
2
+
�
2
+
6
�
−
4
=
0
x
2
+y
2
+6y−4=0 . If the equation of the circle in written in the form
�
2
+
(
�
+
�
)
2
=
�
x
2
+(y+k)
2
=c , where k and c are constants, what is the value of k?
Answer:
Given the equation of the circle in the xy-coordinate plane as x^2 + y^2 + 6x - 4 = 0, we need to rewrite it in the form (x-h)^2 + (y-k)^2 = r^2, where (h,k) is the center of the circle and r is the radius.
Completing the square for x^2 + 6x, we get (x+3)^2 - 9. Thus, the equation becomes (x+3)^2 + y^2 - 9 = 4. Rearranging, we get (x+3)^2 + y^2 = 13.
Comparing with the required form, we get (x-h)^2 + (y-k)^2 = r^2, where h = -3, k = 0 and r^2 = 13. Thus, the value of k is 0.