Which expression is equivalent

Question

Which expression is equivalent to x + y + x + y + 3(y + 5)?

A. 

2x + 5y + 5

B. 

2x + y + 30

C. 

2x + 5y + 15

D. 

2x + 3y + 10

Answer 1

x + y + x + y + 3(y + 5)

Let's combine what we can right now to clean it up a little and not go cross-eyed:

2x + 2y + 3(y + 5)

Distribute:

2x + 2y + 3y + 15

Combine like terms:

2x + 5y + 15