Answer:
C) 8
Step-by-step explanation:
The Distributive property says a(b+c)=ab+ac, using this knowledge, follow the steps provided below to solve the problem :)
1) Distribute -5 to a and 3:
-5a-15=-55
2) Add 15 to both sides:
-5a=-40
3) Divide both sides by -5:
a=8
