my equation is m 2=c. I want to use my equation to find the cost of a 60-mile trip.
Since I doubt that the cost per mile rises, I figure your equation is
c = 2*m
where * means "times"
In that case, c(60) = 2*60 = 120
c = 2*m
where * means "times"
In that case, c(60) = 2*60 = 120