Suppose z = f(x, y), where f is differentiable, x = g(t), and y = h(t). If g(4) = – 4, g'(4) = 9, h(4) = 8, h'(4) = 3, fz( – 4, 8) = – 2, and fy( – 4, 8) = – 8, find dz / dt when t 4.

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