Final answer:
To simplify 7(3z + 12), multiply 7 by each term inside the parentheses.
Step-by-step explanation:
To simplify the expression 7(3z + 12) using the distributive property, we multiply 7 by each term inside the parentheses. This gives us 21z + 84. Therefore, the simplified expression is 21z + 84.
Learn more about Simplifying expressions using the distributive property