The length of A right triangle is 20 and the perimeter of the triangle is 60. What equation determines the length of side A and C?Hint: pythagorean theorem(a^2+b^2+ c^2)

How do i do this activity, is appreciated

What is the result of converting 60 ounces to pounds remember there are 16 ounces in a pound

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.