Gina takes classes at both Westside Community College and Pinewood Community College. At Westside, class fees are $98 per credit hour, and at Pinewood, class fees are
$115 per credit hour. Gina is taking a combined total of 13 credit hours at the two schools.
Suppose that she is taking w credit hours at Westside. Write an expression for the combined total dollar amount she paid for her class fees.