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Mathematics 21 Online
OpenStudy (anonymous):

A car leaves an intersection traveling east. Its position t sec later is given by x = t2 + t ft. At the same time, another car leaves the same intersection heading north, traveling y = t2 + 4t ft in t sec. Find the rate at which the distance between the two cars will be changing 7 sec later. (Round your answer to one decimal place.)

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