Sketch the graph of each line

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

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

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).