Answer
a) $c = 3.85*g$, This is a direct variation as c varies as g changes values.
b) $c = .1203125 * m$
c) $28.88
Work Step by Step
a) c = 3.85*g
As the number of gallons $g$ increases, so would the cost $c$ incurred.
b) A gallon of gas is 3.85, and the car gets 32 miles per gallon. We will substitute $g$ for $m/32$ since we want the cost per mile.
$c = 3.85 * g$
$c = 3.85* (m/32)$
$c = 3.85/32 * m $
$c = .1203125 * m$
c)
$c = .1203125 * m$
$c = .1203125 * 240$
$c = 28.875$
