Answer
$16$ and $74$ are a pair of such ages, for which
there are 526.4 accidents per 50 million miles driven.
(sample answer)
Work Step by Step
Given the vertical lines through x=16 and x=74,
the line through the intersection points with the graph seems horizontal,
so we calculate
$f(16)=0.4(16^{2})-36(16)+1000=526.4$
$f(74)=0.4(74^{2})-36(74)+1000=526.4$
Thus,
$16$ and $74$ are a pair of such ages, for which
there are 526.4 accidents per 50 million miles driven.
