5. Based on data from 2000 to 2016, the average daily volume of the Nasdaq market may be modeled by V(t)=0.06754t^4-1.936t^3+17.97t^2-41.27t+39.03 million shares, where t is the number of years since 2000.

a. Find and interpret the meaning of V(20).

b Find and interpret the meaning of V(20).

c. Use V(20) and V(20) to estimate market volume in time period 21?.

d. Is your estimate for time period 21 an overestimate or underestimate for what it will be? Explain.