The function y=F(x) is graphed below Plot a line segment connecting the points on f where x=0 and x=1. Use the line segment to determine the average rate of change of the function f(x) on the interval

The volume of a spherical hot air balloon v(r) = 4 3 ? r3 changes as its radius changes. the radius is a function of time given by r(t) = 3t. find the instantaneous rate of change of the volume with respect to t at t = 2.