Cory earns $20 for every lawn he mows and $9 for every hedge he trims. he uses the expression 20x + 9y to keep track of his earnings.

part a: identify the coefficients and 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 shows the total earned from trimming hedges?

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