What is 9x+3x^2-4x^5+x^3+2x^4 in standard form

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

What is the sum of these mixed numbers 2 1/8 + 4 3/8

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?