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Question 5 (0.5 points) Please note the two parts in this question are not related. (a) Find an equation of the tangent plane to the surface of z = 2x2y + e(3ry-y?) at (1,3, 7). . (b) Given that the function T = f(x, y, z) is a differentiable function with f(-2, 1, -3) = 1, fx(-2, 1, -3) = -2, fy(-2, 1, -3) = -3, fz(-2, 1, -3) = 4, find the linear approximation and the differential of the function at (-2,1,-3). Use the differential to estimate the total change AT when x is increased by 0.04, y is decreased by 0.05, and z is increased by 0.03. Enter your answer in the blank below. Round your answer to two decimal places. Your