Verified Answer :

  1. Subtraction. According to the order of operations, he should've done the exponent of 3 first.

    18. He then did 15×2. According to the order of operations, he should've done the multiplication of 8×2, since, if there are only multiplication and/or division left, you work left to right. He isn't correct.

    19. 16, I think, I did it in my head.
  1. The student did the exponent operation first. 3^2=9. The student is correct.
    18. The student made a mistake in the second step by subtrating, when he was supposed to multiply 8×2.
    19. Correct asnwer is 16:
    23-8×2+3^2=
    =23-8×2+9=
    =23-16+9=
    =7+9=
    =16

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