Each week, allen earns $70 for every shift he works at the diner and $12 for every dog-walking job. he uses the expression 70x+12y to keep track of his earnings.

part a: identify the coefficients and the variables in the expression.

part b: how many terms are in the expression, what are they, and how do you know?

part c: which term in the expression shoes the total earned from the diner?