Question

Retail revenue each year from internet shopping is approximated by the function

.TR(t)=0.075t^3+0.025t^3+2.4

where TR(t)is measured in billions of dollars andtis measured in years, with t=0 corresponding to the beginning of the year 2000.

a)Find an expression giving the rate of change of the retail revenue per year from internet shopping at any timet.

b)Is on-line retail revenue increasing or decreasing over time? Explain your answer.

Answer 1

ул- Retail Revenves - Тр(+) = об+5 +3+2 Stt24 Co-1) 3 + 2 4 rate change of o retai revenues (Te( ) О• 3 t2 at Ao T TR'Lt) • 312 2D Бі ou t7, D on-line retail revenue increasing 9. Ц