Slope is 1/2. Give brainly or I wont answer another one of your questions
Step-by-step explanation:
<h2>-20 is the right answer.</h2>
(You copied 'upper left' twice, and you left out 'lower right'.
But we know what you mean.)
If those are the corners of the wall, then they're ALL in the plane of
the wall (coplanar with it).
