We replace each occurrence of z with the number 4, and simplify
(1 + z) × 2 + 12 ÷ 3 - z
It is not clear what is being divided by the last terms.
To replace each occurrence of z with the number 4, you simply substitute z with 4 in the expression:
(1 + 4) × 2 + 12 ÷ 3 - 4 = 5 × 2 + 12 ÷ 3 - 4
Now let's simplify the expression by following the order of operations (also known as PEMDAS or BODMAS):
Step 1: Perform multiplication and division from left to right
5 × 2 = 10
12 ÷ 3 = 4
So the expression becomes:
10 + 4 - 4
Step 2: Perform addition and subtraction from left to right
10 + 4 = 14
14 - 4 = 10
Therefore, the simplified expression is 10.