Explanation:
Evaluate 2 ∙ (8 + 4) using the steps of order of operations: Add 8 and 4 and multiply the sum (12) by 2 and you get 24.
Evaluate 15 + 6 ∙ 3 using the steps of order of operations: multiply 6 by 3 and add the product (18) by 15 and you get 33.