The 12th Annual Balloon contest was held last Friday. The surface area of a balloon is s(r) = 4πr^2 where r is the radius if the balloon in meters.
a. Find the surface area of the balloon as a function of time if the radius is increasing with time t (in seconds) according to the formula r(t) = 2/3t^3
b. What are the dependent and independent variables in function s in terms of r, function s in terms of t and function r?
thanks