Which of the following operations will change the solution of the system x − y = 2 and 3x − 3y = 2?

1. what is the measure of ∠abc? what is the measure of ∠abd?

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items