Answer:
down below
Step-by-step explanation:
straight lines are 180 degrees and you have 2 angles on a line. one of which is 72 and the other is unknown. It is solved for below.

your missing degree is 108.
i may not be right, if i'm not i am very sorry.
Answer:

Step-by-step explanation:
The formula of a slope:

Substitute the coordinates of the given points (-1, -1) and (2, -2):
