Answer: 80
Step-by-step explanation: To solve this problem, we first substitute 7 in for x inside the parentheses and we have 8 (3 + 7).
Following your order of operations, you should simplify what's inside the parentheses first. So 3 + 7 simplifies to 10.
Bring down your 8 and you have 8 (10) which equals 80.
