a) Find the equation of the tangent plane to z = f (x, y) = 3x² + 2y² +5 at the point (1,1,10). b) Use the linear approximation of z = f(x, y) at (1,1,10) to approximate the value of f(0.05, 1.05). Round to 3 decimal places. c) What is the angle between the tangent planes to z = f(x, y) = 3x² + 2y² +5 at (0,0,5) and (1,1,10)? Round to the nearest 10th of a degree.

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