Simplify 5 to the negative 4th power over 5 to the 3rd.

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.

Is there an x intercept in the equation 60*1.15^x

5cakes cost 3.50 how much do 7 cakes cost