Item 3 is unpinned. Click to pin. When Grant was 9 years old he was 54 inches tall. Grant is now 12 years old and he is 66 inches tall. Find the percent of increase in Grant’s height.

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.