a) Compute ««E x - y x + 2y d A, where E is the parallelogram with vertices (0 0), (2/3, -1/3), (1, 0), (1/3,

a) Compute ˆ«ˆ«E ˆšx - y ˆšx + 2y d A, where E is the parallelogram with vertices (0 0), (2/3, -1/3), (1, 0), (1/3, 1/3).
b) Compute ˆ«ˆ«E 3ˆš2x2 - 5xy - 3y2 dA, where E is the parallelogram bounded by the lines y = x/3, y = (x - 1)/3, y = -2x, y = 1 - 2x.
c) Find

where E is the trapezoid with vertices (1,1), (2, 2), (2, 0), (4, 0).
d) Given ˆ«10 (1 - x)/f(x)dx = 5, find

Le f(x y) dy dx.