11 (5 pts.) The surface area of a cube increases at a rate of k square meters per second. At what rate is the side length changing when the length of a side is R meters? Express your answer in terms of k and R, and include units. 12 (5 pts.) Sketch a graph of a function y = f(r) on the axes below that has all of the following properties: . lim f(x) = -1 lim f(x) = 3 lim f(I) = 00 I- - 2 - 14 -2+ . f ( -2) = 1 . lim f(x) = 0 lim f(x) = 2 3 2 -3 -2 3 -2 -3