Angelina receive two discounts on a $50 pair of shoes the discount for taking off one after the other if she paid $30 for the shoes what was the percent discount coupon is only one answer to this question?

What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1