Find the radius of the circle after 10 seconds. Find the radius of the circle after 15 seconds.

Question

The radius of the circle is increasing at the rate of 6.25 feet per second.

Answer 1

dR/dt = 6.25

R(t) = 6.25t + k, where k is the starting radius at time t=0

R(10) = 62.5+k and R(15) = 93.75+k