Question

Frankie takes classes at both Southeast Community College and Lakeside Community College. At Southeast, class fees are $85 per credit hour, and at Lakeside, class fees are $108 per credit hour. Frankie is taking a combined total of 12 credit hours at the two schools.Suppose that she is taking scredit hours at Southeast. Write an expression for the combined total dollar amount she paid for her class fees.

Answer 1

Mathematical Models

We can build mathematical models to explain and predict situations in real life.

This example is about the situation of Frankie who takes credit hours at two different colleges. One of them charges $85 per credit hour and the other charges $108 per credit hour.

At the end of the question, we are told she takes s credit hours at Southeast and we also know the total credit hours are 12 in both colleges.

This means that she is taking 12 - s hours at Lakeside College.

The total amount she paid is:

T = 85*s + 108*(12 - s)

Operating:

T = 85*s + 108*12 - 108*s

T = 1296 - 23s

This should be your selection: