3a) Find this antiderivative. Use a formula from Section 7.2 if you like. (10 pts) B Vx2-36 dx 3b) Use your answer in (a) to find 14 B 10 Vx2-36 dx Use a calculator for the arithmetic. Show work. Write your answer to 3 decimal places. 3c) Use Trapezoid Rule and 12 subdivisions to approximate the integral in (b). Show all calculations, and write your answer to 3 decimal places. 4) Find all first partials and second partials of ... (8 pts) a) Ax, y) = x2 +12 b) g(x, y) = xe 5) Find the minimum value of f(x, y) = x2 + 4y subject to the constraint 3x + 5y = 15. Use calculus. Use a calculator for the arithmetic. (5 pts) 6) The x-axis of a 3-dimensional coordinate system points to the left, and the y-axis points away from you. Which way does the z-axis point? (2 pts) 7) Find and graph the level curve of z = e" - x for the value z = 5. No calculator. (5 pts)