The average rate of change of the function f(x)= the square root of x. From x1=36 to x2=81
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we know T = (y2 - y1)/(x2 - x1)
and y1 = f(x1) = sqrt(36) = 6
and y2 = f(x2) = sqrt(81) = 9
T = (9 - 6 ) / (81 - 36 ) = 3/ 45
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