Which is the best estimate for the average rate of change for the quadratic function graph on the interval −3 ≤ x ≤ −2? a) −2 b) −4 c) −6 d) −8

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

answer:

f(5/2) = 10/3

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