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. part a: identify the coefficients and variables in the expression. (3 points) part b: how many terms are in the expression, what are they, and how do you know? (4 points) part c: which term in the expression shows the total earned from the dog-walking jobs? (3 points)