Which of these inequalities are equivalent to r > -11? Check all that apply. [A] -r < 11 [B] 3r < -33 [C] 3r > -33 [D] -3r < 33 [E] -3r > 33

Answer 1

(a) -r < 11

r > -11 <--- multiplies both sides by -1, inequality sign changes

(c) is the same after dividing both sides by 3

(d) is the same after dividing both sides by -3, thus changing the inequality