Two oil tankers crash in the Pacific ocean. The spreading oil slick has a

circular shape, and the radius of the circle is increasing at 200

meters per hour.

a) Express the radius of the spill, r, as a power function of time, t,

in hours since the crash.

b) Express the area of the spill, A, as a power function of time, t.

For a) would the formula be f(r) = 200t^2?

For b) would the formula be f(a) = pi(200t)^2?

Thanks for the help.