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azamat
3 years ago
11

The neighborhood association is buying timbers to put around the edge of the playground. The length of the playground is 51 1/8

ft. The width is 38 1/4 ft. What is the perimeter of the playground?
**HINT - you should convert your fraction to a decimal.
Select one:
A. 178.75 ft
B. 178.25 ft
C. 89.25 ft
D. 89.75 ft
Mathematics
1 answer:
Olegator [25]3 years ago
7 0
Hello!

First, we must convert 51 1/8 and 38 1/4 to a decimal:

(51 × 8) + 1 = 409

Next, divide that by 8.

409 ÷ 8 = 51.125

Convert 38 1/4 using the same method.

(38 × 4) + 1 = 153

153 ÷ 4 = 38.25

The formula for perimeter is:

2l + 2w

Substitute:

2(51.125) + 2(38.25) = 178.75

The perimeter of the playground is A. 178.75 ft.
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In how many ways can Susan arrange 7 books into 5 slots on her bookshelf?
KatRina [158]

Answer:

  • 2520

Step-by-step explanation:

This is permutation question

<u>The formula for it: </u>

  • N = b!/(b-s)!, where N- number of ways, b- number of books, s- number of slots

<u>Finding the answer:</u>

  • N = 7!/(7-5)! = 7!/2! = 7*6*5*4*3 = 2520
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3 years ago
Someone KEEPS answering my questions and THERE ANSWERS ARE RIGHT. AHH HOW? srlt2 you smart. Anyways does anyone wanna help me
vekshin1

Answer:

lol, hello again!

SA = 456 cm²

Step-by-step explanation:

small rectangle SA: 6*4 + 6*8 + 6*4 + 6*8 + 4*8 = 176

large rectangle SA: 2*14 + 2*8 + 2*14 + 2*8 + 8*14 + (8*14 - 8*4) = 280

Total SA = 176 + 280 = 456

7 0
3 years ago
60% of what number is 21
Lerok [7]
60% of 35 is 21 

Change the percentage (60) into a decimal by dividing it over 100:
\frac{60}{100} = 0.6

Divide 21 by the decimal:
<span>\frac{21}{0.6} = 35</span>
3 0
2 years ago
Read 2 more answers
50 POINTS
Marina86 [1]

vi is going in the positive direction (up). (That's my choice). a (acceleration) is going in the minus direction (down). The directions could be reversed.

Givens

vi = 160 ft/s

vf = 0 (the rocket stops at the maximum height.)

a = - 9.81 m/s

t = ????

Remark

YOu have 4 parameters between the givens and what you want to solve. Only 1 equation will relate those 4. Always always list your givens with these problems so you can pick the right equation.

Equation

a = (vf - vi)/t

Solve

- 32 = (0 - 160)/t Multiply both sides by t

-32 * t = - 160 Divide by -32

t = - 160/-32

t = 5

You will also need to solve for the height to answer part B

t = 5

vi = 160 m/s

a = - 32

d = ???

d = vi*t + 1/2 a t^2

d = 160*5 + 1/2 * - 32 * 5^2

d = 800 - 400

d = 400 feet

Part B

You are at the maximum height. vi is 0 this time because you are starting to descend.

vi = 0

a = 32 m/s^2

d = 400 feet

t = ??

formula

d = vi*t + 1/2 a t^2

400 = 0 + 1/2 * 32 * t^2

400 = 16 * t^2

400/16 = t^2

t^2 = 25

t = 5 sec

The free fall takes the same amount of time to come down as it did to go up. Sort of an amazing result.

6 0
3 years ago
For an activity in class, student used pieces of string to measure road on a map. They used a map scale to determine the distanc
ivanzaharov [21]

Answer:

Step-by-step explanation:

85miles¯\_(ツ)_/¯

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3 years ago
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