Simplify the following expressions -5(-7x + 4 + 9y)

Given: and prove: what is the missing reason in the proof? given transitive property alternate interior angles theorem converse alternate interior angles theorem

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?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)