Question

A college student has set aside $240 for the rest of the school year to use the
coin
-
operated laundry facility in his dormitory. Each time he uses the machines, it costs
$7.50. Choose the equation that represents the amount remaining in his fund,
f
, after he
has done laundry
x
times. Find the amount remaining in the fund after 12 trips to the
laundry facility.

Answer 1

f(x) = 240-7.5*x
f(12) = 240 - 7.5*12
=150

Answer 2

Thank you so much :D