Andy was at Level –1 and took the elevator to Level 21. How many levels did the elevator move upward?

[15 points, algebra 2]simplify the complex fraction and find the restrictions.

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate.in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30

What is the slope of the line passing through the points (-5, 7) and (-3,5)?