23 is between which two prefect squares? Between which two integers is √23

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.

If f(x)= 3x+6 which of the following is the inverse of f(x)

Explain how you can use the associative property to evaluate (7x50)x4.