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Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

Plz hurry finals a paper cup in the shape of an inverted cone is 8 inches tall and has a radius of 1.5 inches. how much water can the cup hold? use 3.14 for pi. round the answer to the nearest tenth. a) 12.6 cubic in. b) 18.8 cubic in. c) 37.7 cubic in. d) 56.5 cubic in.