Answer
4
Work Step by Step
$\frac{Δy}{Δx}$ = $\frac{[(4\times5)-9]-[(4\times2)-9]}{5-2}$
$\frac{Δy}{Δx}$ = $\frac{11+1}{3}$
$\frac{Δy}{Δx}$ = $4$
the average rate of change equal to 4
so the instantaneous rate of change also equal to 4
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