I need help on my practice sheet. needs to be simplified​

Solve for x, y, and z. show all steps.

It takes a total of 6 hours to fill up an inground backyard pool using a standard house. a function can represent this situation to represent the amount of water in the pool until it is full a function of time the hose is running. determine the domain for the function

The volume of a cube is 8 in to the 3rd power. how long is each side?