The sides of a quadrilateral ABCD move at a point speed of 2 centimeters per second. How long will it take to get around the whole quadrilateral, if the area of the quadrilateral is 5cm2?​

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problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

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