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AVprozaik [17]
2 years ago
14

a square swimming pool has a cement sidewalk around it. The sidewalk is the same width all the way around. The outside perimeter

of the sidewalk is 80 feet. What is the width of the sidewalk if the area of the pool is 225 square feet?​
Mathematics
1 answer:
VLD [36.1K]2 years ago
6 0

Answer:

175 square feet

Step-by-step explanation:

the area of the whole thing is 400 ft. (20 x 20=400)

i got the 20 from the perimeter b/c 20+20+20+20=80

then subtract the area of the pool from 400 to get 175.

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igomit [66]

Answer: The Answer is 5 1/8.

Step-by-step explanation:

6 0
3 years ago
Nickel-63 has half-life of about 96 years. after 336 years,about how many milligrams of an 800 mg sample will remain?
vagabundo [1.1K]
F=ar^t if the half-life is 96 years...

.5=r^96

ln(.5)=96lnr

ln(.5)/96=lnr

r=e^((ln.5)/96)

f=800e^(336(ln.5)/96)

f=70.71

So about 71mg will remain after 336 years.


5 0
3 years ago
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if mary's home is worth $78,900 what is her coverage for landscaping and trees if insurance covers 5 percent?
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3945,multiply 78,900 by .05
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3 years ago
8. GradPoint question
Naddika [18.5K]

Answer:

I'm sorry but I have no clue. Actually I think it's C.

Step-by-step explanation:

5 0
2 years ago
Devin signs a note for a discounted loan agreeing to pay $2,700 in 6 months at a discount rate of 7%. Determine the amount of th
grandymaker [24]

Answer:

discount= $94.5

Proceeds=$2605.5

Step-by-step explanation:

amount Dawin has to pay= $2700

in 6 months time

at a discount rate of 7%

here future value = $2700

D= discount before m months is given by

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putting values

D= \frac{2700\times 7\times 6}{1200}

solving we get

D= $94.5

now present value = future value - discount

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3 years ago
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