Let f(x)=3x2-2x. (a) Use the definition of derivative and the Procedure/Example box in this section to find the derivative. ('(x)= (b) Find the instantaneous rate of change of f(x) at x = -1. (c) Find the slope of the tangent to the graph of y = f(x) at x = -1. (d) Find the point on the graph of y = f(x) at x=-1. (x, y) =