Problema Solution
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 provided by our tutors
one use of the laundry machine costs 7.50 and after one use there are 240 - 7.50 dollars left in the fund
after x uses the total cost is 7.50*x and there are 240 - 7.50*x dollars left in the fund
thus we can write the following equation that represents the amount remaining in his fund that represents after he
has done laundry x times:
f(x) = 240 - 7.5*x
after x = 12 trips to the laundry facility
f(12) = 240 - 7.5*12
f(12) = $150
there are $150 remaining in the fund.