Integrate (x + y) dA, where R = {(x, y):0 < x < 2, x < y < x + 4}. Use the transformation x = 2u and y = 4v + 2u. Hint: Sketch the given region R and then the new region in the uv plane.

Q: 5. Evaluate ff ex²dA where R is the triangular region bounded by y = 2x, y = 0, and R x = 2.

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Q: 19. y² dA, D is the triangular region with vertices (0, 1), (1, 2), (4, 1)

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