Question

4 what is the value of the expression below when z = 7? 3z - 3 a 21 b 18 c 12 d 34

Explanation:

Step1: Substitute \( z = 7 \) into the expression

Substitute \( z = 7 \) into \( 3z - 3 \), we get \( 3\times7 - 3 \).

Step2: Calculate the multiplication first

Calculate \( 3\times7 = 21 \), so the expression becomes \( 21 - 3 \).

Step3: Calculate the subtraction

Calculate \( 21 - 3 = 18 \).

Answer:

B. 18