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2 years ago

The drawing shows a concrete walkway around a pool. what is the total area of the concrete?

Mathematics

2 answers:

vodomira [7]2 years ago

8 0

Answer:

Hence, area of concrete is: 165 ft^2.

Hence, option: A is the correct answer.

Step-by-step explanation:

We have to find the total area of the concrete.

The area of concrete is given by:

Area of rectangle ( with dimensions 25 ft × 13 ft. )- Area of rectangle ( with dimensions 20 ft. × 8 ft. )

Hence,

Area of rectangle with dimensions 25 ft × 13 ft. is

25×13=325 ft^2.

Also area of rectangle with dimensions 20 ft. × 8 ft. is:

20×8=160 ft^2.

Hence, area of concrete is calculated as:

325 ft^2-160 ft^2=165 ft^2.

Hence, option: A is the correct answer.

Hence, area of concrete is: 165 ft^2.

Verizon [17]2 years ago

3 0

25 x 13 = 325

20x 8 = 160

325-160 = 165 square feet

answer is A

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This table represents a quadratic function. x y 0 -3 1 -3.75 2 -4 3 -3.75 4 -3 5 -1.75 What is the value of a in the function’s

serg [7]

Answer:

a = 0.25

Step-by-step explanation:

Our strategy to solve this problem will be to use the information given in the table to obtain first the value of c in the quadratic equation which has the form ax^2 + bx + c and then form a system of 2 linear equations and solve for the coefficients a and b as follow:

from x=0 and y=-3 a*0 + b* 0 + c = - 3

c = -3

from x=1 and y= -3.75

a*(1) + *(1) + (-3) = -3.75

a + b = -3.75 + 3 = -0.75

from x= 2 and y = -4

a* (2)^2 + b*(2) + (-3) = -4

4a + 2b = -4 +1

4a + 2b = -1

Now we can solve the system f equations by elimination:

a + b = -0.75

4a + 2b = -1

multiply first equation by -2 and add to the second and get

-2a - 2b = +1.50

4a + 2b = -1

2a = 0.50 and substituting into any of the equations get b = -1

so the quadratic equation has a= 0.25 b= -1 c= -3

we can even plug the any of the other values for x given in the table and check the answer.

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2 years ago

Read 2 more answers

Which statement holds true for a skewed histogram showing a distribution of the weights of students in a class?

Vanyuwa [196]

Among the choices, the statement which describes a skewed histogram showing a distribution of the weights of students in a class is:

<span>"The nature of the skew can be verified by the position of the mean with respect to the mode."

The histogram is skewed to the right if the mean is less than the mode and the histogram is skewed to the left if the mean is more than the mode. </span><span />

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2 years ago

a school baseball team raised $810 for new uniforms. each player on the team sold one book of tickets. There were 10 tickets in

antiseptic1488 [7]

27
Multiply 10 and 3 because thats how much each book is worth.
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2 years ago

The average time taken to complete an exam, X, follows a normal probability distribution with mean = 60 minutes and standard dev

k0ka [10]

Answer: b. 0.8413

Step-by-step explanation:

Given : The average time taken to complete an exam, X, follows a normal probability distribution with $\mu=60\text{ minutes}$ and $\sigma=30\text{ minutes}$ .

Then, the probability that a randomly chosen student will take more than 30 minutes to complete the exam will be :-

$P(x>30)=P(z>\dfrac{30-60}{30})\ \ [\because\ z=\dfrac{x-\mu}{\sigma} ]\\\\=P(z>-1)=P(z-z)=P(Z$

[using z-value table]

Hence, the probability that a randomly chosen student will take more than 30 minutes to complete the exam = 0.8413

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2 years ago

Ella takes 1 3/5 hours to complete a painting. Holly takes 3/4 of the time that Ella takes. How long will Holly take to complete

Misha Larkins [42]

1. you have to figure out what 3/4 of Ella's time is.
$1 \frac{3}{5} = \frac{8}{5}$
(You find that out by multiplying 5x1. Then add 3.)
2. Convert the fractions into decimals. (This will help make it easier when dividing.)
$\frac{8}{5} = 8 \div 5 = 1.6$
$\frac{3}{4} = 3 \div 4 = .75$
3. Next you are going to divide 1.6 by .75
$1.6 \div .75 = 2.13$
4. Now multiple 2.13 by 5.
$2.13 \times 5 = 10.65$
Answer is 10

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2 years ago