V The surface area S (r) (in square meters) of a spherical balloon with radius r meters is given by S (r) = 4ur-. The radius P (t) (in meters) after t seconds is given by P (t) = 2 t. 7 Write a formula for the surface area N (t) (in square meters) of the balloon after t seconds. It is not necessary to simplify. N (1) = 1 O X 5