Answer:
degrees
Step-by-step explanation:
Angles on a straight line add up to 180 degrees.
Thus, 

Divide both sides by 4:


The best example of a plane would be A) the surface of a flat table. A plane could also be represented by anything that is flat in nature.
Hope this helps! :)
Answer: 275$
I'm not entirely sure I did this right! But at least try!!!
Step-by-step explanation:
20/100 = 55/x (cross multiply)
20x = 5,500 (divide)
X = 275
f(x) means x = -2 if you multiply 1/2 by -2 you get -1