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I have posted a link there to this topic so the OP can see my work.Hard calculus question involving hydrostatic force?

A swimming pool is 10 ft wide and 20 ft long and its bottom is an inclined plane, the shallow end having a depth of 4 ft and the deep end, 7 ft. Assume the pool is full of water. (Round your answers to the nearest whole number. Recall that the weight density of water is 62.5 lb/ft3.)

(a) Estimate the hydrostatic force on the shallow end.

?? lb

(b) Estimate the hydrostatic force on the deep end.

? lb

(c) Estimate the hydrostatic force on one of the sides.

?? lb

(d) Estimate the hydrostatic force on the bottom of the pool.

?? lb

Please answer all 4 questions. Thanks