#### Answer

A. 50
B. At V(0), the tank is full. At V(20), the tank is empty.
C. 0 50
5 28.125
10 12.5
15 3.125
20 0
D. Change in Volume = V(20) - V(0) = 50 - 0 = 50 gal

#### Work Step by Step

A.
V(0)=50(1-$\frac{0}{20}$)$^{2}$
=50(1-0)$^{2}$
=50
V(20)=50(1-$\frac{20}{20}$)$^{2}$
=50(1-1)$^{2}$
=0
C.
t | V(t)
0 | 50
5 | 28.125
10 | 12.5
15 | 3.125
20 | 0
D. This problems asks you to find the difference between the two inputs from part A:
50-0=50