# Chapter P, Prerequisites - Section P.9 - Modeling with Equations - P.9 Exercises - Page 70: 21

$400$ miles

#### Work Step by Step

Total cost of renting the truck is: $C=65*d+0.20*m$, where $d$=days rented and $m$=miles driven. For Michael, the cost is \$275 for 3 days:$275=65*3+0.2*m$We solve for$m$:$m=(275-65*3)/0.2=80/0.2=400\$ miles

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