Functions f, g, and h are twice-differentiable functions with g(5) = h(5) = 1. The line y = 1 -? (x - 5) is tangent to both the graph of g at x = 5 and the graph of h at x = 5. (a) Find g'(5). (b) Let b be the function given by b(x) = 2x2g(x). Write an expression for b'(x). Find b'(5). (c) Let w be the function given by w(x) - 3h(x)-x 2x+1 -. Write an expression for w'(x). Find w' (5). (d) Use the tangent line to the graph of h(x) at x = 5 to approximate h(4.8)