15.5.1 Study: Equivalent Expressions Equivalent Expressions When two expressions are equivalent, they always have the same value. Study guide These are some examples of expressions. An expression is a mathematical statement that uses numbers, operations, letters, or a combination of all three. d - 7 8 + 1 4 When two or more expressions are equivalent, they have the same value. 4+2 +6 and 5 + 7 are equivalent expressions because they are both equal to 12. 5x and 5.xare also equivalent. Attempt 1 of 2 Check Your Understanding Match the equivalent expressions. 12 ? 100 - 88 7+9-1 ? 3x 3• ? 13 5+3 +5 ? 15 HINT SUBMIT

The westins and the shermans live in the same city and pay the same sales tax rate, and both families made $14,000 in taxable purchases last year. if the westins made $86,000 and the shermans made $33,000 last year, is the sales tax in their city an example of a regressive tax? yes, because the westins and the shermans both paid the same sales tax rate. b. no, because the shermans paid a higher percentage of their income in sales tax than the westins did. c. no, because the westins and the shermans both paid the same sales tax rate. d. yes, because the shermans paid a higher percentage of their income in sales tax than the westins did.