Step-by-step explanation:
its 175 for one time you rent it and 15 extra dollars for everyday you keep. so the equation should look like this:
175+15d=c
the variable in this equation is the 15 dollars because it varies.
if you keep it for 5 days the equation should look like this:
175+15(5)=c
then you solve:
175+15(5)=c
175+75=250