Im very rusty heres my problem, please help thanks! The radius of a sphere is expanding at the rate of 1 meter/min. At t=0 the radius is 1. In earch case, find the requested function and sketch the curve. a)The surface area of the sphere as a function of the time; For this i took: dR/dt = 1 m/min A=4*Pi*r^2 dA/dt=8*pi*r*dR/dt dA/dt = 8*pi*r <--- if this is right how do i sketch this graph as a function of time?? my graph points that i ploted were (0,8pi),(1,16pi),(2,24pi) etc... but this is confusing me because at t=0 radius is 1... is my x-axis supposed to be time or radius someone help me im confused..