Answer:
B
Step-by-step explanation:
It opens downwards so it looks like this “n”. That is because a in the formula is a negative number in this situation
Answer:

Step-by-step explanation:
Answer:
0
Step-by-step explanation:
Angle x+45 = (145-55) / 2
2x + 90 = 90
2x = 0
x = 0