Kim has 5 yards of denim. She cuts each yard of denim into thirds. How many 1/3-yard pieces of denim does she have? Pls I need help T^T

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.

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse