**Part A**

The coefficients are **7.50** and **0.20**.

The variables are **h** and **s**.

**Part B**

Put 25 where h is; put 300 where s is; do the arithmetic.

... 7.50·25 + 0.20·300 + 40 = 187.50 + 60.00 + 40 = **287.50**

**Corinne earns $287.50 for the week**.

**Part C**

7.50 in the expression represents Corinne's hourly earnings. If that changes to 9.00 per hour, then the expression becomes

**9.00**h + 0.20s + 40

The 7.50 changes to 9.00.