(5 points) Suppose f(x) = 12 - x2. (a) Find the slope of the tangent line to the graph y = f(@ ) when r = -1. f(x + h) - f(x) Slope = lim lim = h +0 h h 0 (b) Find an equation for the tangent of to the curve y = f(@) at the point (-1, 11). Tangent line: y= (c) On a piece of paper, sketch the curve y = f(@) and the tangent line together