Simplify -3 over 2 ÷ 9 over 6

Select one:
a. -4
b. -1
c. 4
d. 1

Which graph represents the following piecewise defined function?

Solve the system of equations. y= 2x y= x^2 - 15

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.