Which is the better deal? 1 pack of paper for $2.50 2 packs for $4.00 3 packs for $6.50 4 packs for $10.00

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 x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

Find the value of x. round the length to the nearest tenth