Aaron has a smart phone data plan that costs $40 per month that
includes 6 GB of data, but will charge an extra $25 per GB over the
included amount. How much would Aaron have to pay in a month
where he used 3 GB over the limit? How much would Aaron have to
pay in a month where he used went over by x GB?

Total cost when over by 3 GB:

Total cost when over by x GB:

Pls give me correct answer
I need it or else I fail