This is a high school grade question

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

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?