What is the lcm of two numbers if one number is a multiple of the other? give an example.

What number should be added to both sides of the equation to complete this square? x^2-10x=7

What is the solution to the equation below? 3/x-2+6=square root x-2 +8

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?