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Do the next Three problems 4,5 and 6 4. Calculate I dA, R = [0, 1] x [0, 1] . 5. Evaluate the volume of the solid below the graph of z = y and above the region D in the ay-plane, defined as the set of points in the first quadrant between the circles x2 + y? = 1 and 12 + y? = 9. 6. Evaluate the following by sketching the region of integra- tion, expressing the sum as a single integral and finally changing the order of integration. " Ladydady + /J avydady