Kim borrowed $400 from her parents to purchase a new cell phone. the table represents kim's repayment schedule. which inequality states the domain of the relation?

The domain tells you about the independent variable, number of payments made. So the inequality should be smallest number of payments made ≤ variable representing payments ≤ largest number of payments made. The smallest number of payments is 0 and the largest is 8, so you'll have
0≤variable≤8

The answer is 10. and if you go by pemdas you would 1. multiplication 2. division 3. addition 4. subtraction