Assume f and g are differentiable functions with h(x) = f(g(x)). Suppose the equation of the line tangent to the graph of g at the point (4,7) is y = - 2x + 15 and the equation of the line tangent to the graph of f at (7,6) is y = 3x - 15. a. Calculate h(4) and h'(4). b. Determine an equation of the line tangent to the graph of h at the point on the graph where x= 4.

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