Multiple choice, need help with this ASAP; I'll give BRANIEST to whoever gets it right and no links​

When only separate discreet points are graphed it is called?

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

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?