How do you write y+4=2/3(x+7) in standard form?

The sum of two numbers is 86, and their difference is 20. find the two numbers

Write the rational number in lowest terms 99/-15

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?