Answer:
7) ((1/6)(2²) + (1/3)(3²) + (1/8)(5²) + (3/8)(3²))π
= (2/3 + 3 + 25/8 + 27/8)π
= 61π/6
8)
((1/12)(6²) + (1/6)(3²) + (1/9)(2²) + (5/36)(6²))π
= (3 + 3/2 + 4/9 + 5)π
= 179π/18
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