Question

A circular oil slick is expanding with radius, r in feet, at time t in hours given by r=12t−0.3t^22, for t in hours, 0≤t≤10.
Find a formula for A=f(t), the area of the oil slick as a function of time.

Answer 1

same as last time -- just replace r with the function of t, in

A = πr^2