Question

add.
(9z + 5) + (3z + 4)

Explanation:

Step1: Remove parentheses

$(9z + 5) + (3z + 4) = 9z + 5 + 3z + 4$

Step2: Combine like terms

$9z + 3z + 5 + 4 = (9+3)z + (5+4)$

Step3: Calculate sums

$12z + 9$

Answer:

$12z + 9$