Question

add. (7c + 3) + (2c + 9)

Explanation:

Step1: Remove parentheses

Since there is a plus sign before each parentheses, we can remove them directly. So we get $7c + 3+2c + 9$.

Step2: Combine like - terms

Combine the terms with the variable $c$ and the constant terms. $(7c+2c)+(3 + 9)=9c+12$.

Answer:

$9c + 12$