Customers of a phone company can choose between two service plans for long distance calls. The first plan has a $23 monthly fee
and charges an additional $0.15 for each minute of calls. The second plan has a $28 monthly fee and charges an additional $0.10 for each minute of calls. For how many minutes of calls will the costs of the two plans be equal?
We represent the unknown number x. The product of this number and -3 is -3x. This product should be no more than 15. This also means that the product should be less than or equal to 15. This is shown in the inequality, -3x ≤ 15 The answer is letter B.
