Each week, alfonso earns $85 for every shift he works at the theater and $15 for every dog-walking job. he uses the expression 85x + 15y to keep track of his earnings.

So you didn't put an actual question. To find the money he makes you just plug in the numbers.
If he works 4 shifts at the theater you replace x with 4. Then, you find 85 x 4. You do the same thing with 15y.

I’m not so sure about this one.