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A triangle with area A=1/2 bh is expanding with time such that the length of the base, b(t) = t2 + 2, and the height

A triangle with area A=1/2 bh is expanding with time such that the length of the base, b(t) = t2 + 2, and the height of the rectangle is constant at h = 4. What is the formula for the rate of change of the area of the triangle with respect to time? explain 

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