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(1 point) Let / be the length of a diagonal of a rectangle whose sides have lengths x and y , and assume that x

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(1 point) Let / be the length of a diagonal of a rectangle whose sides have lengths x and y , and assume that x and y vary with time. If x increases at a constant rate of - ft/s and y decreases at a constant rate of - ft/s, how fast is the size of the diagonal changing when x = 7 ft. and y = 6 ft?

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