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Naddik [55]
3 years ago
11

What is the answer to # 7 and how did you solve it? Please Help!!

Mathematics
1 answer:
omeli [17]3 years ago
6 0
He has 30 gallons left
5/8 = 50/80
80-50=30
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Emma jogs 2 miles along the beach in
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A spherical exercise ball has a maximum diameter of 30 inches when filled with air. The ball was completely empty at the start,
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Answer:

A) A(t)  =  4500*π  -  1600*t

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C) t  =  8,8 sec

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The volume of the sphere is:

d max  =  30   r max  =  15 in

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V(s) = 4500*π

A)  Amount of air needed to fill the ball A(t)

A(t)  = Total max. volume of the sphere - rate of flux of air * time

A(t)  =  4500*π  -  1600*t    in³

B) After 4 minutes

A(4)  =  4500*π  - 6400

A(4)  =  14130 - 6400

A(4)  =  7730 in³

C)  A(t)  =  4500*π  -  1600*t  

when  A(t) = 0   the ball got its maximum volume then:

4500*π -  1600*t  =  0

t  =   14130/1600

t  =  8,8 sec

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