C is the correct answer !!
Yeah, mostly is has to be negative, but in some cases a is greater than 1 than we do some other operations.
Answer:

Step-by-step explanation:

1. distribute

2. collect like terms

3. solve


:D
Answer:
200
Step-by-step explanation:
160/80 is 2. 2 times 100 is 200
M AR = 55°
m RB = 66°
Like AB=8 m =RS →m RS = m AB
m AB = m AR + m RB
m AB = 55° + 66°
m AB = 121°
m RS = m AB
M RS = 121°
Answer: m RS is 121°