question is in description.

Question

a car leaves an intersection traveling west. Its position 4 sec later is 20 ft from the intersection. At the same time, another car leaves the intersection heading north so that its position t sec later is t^2+2t ft from the intersection. If the speed of the first car 4 sec after leaving the intersection is 9ft/sec, find the rate at which the distance between the two cars is changing at that instant of time.

Answer 1

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