Question

Can someone please help me with these problems?

Answer 1

17. 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

Answer 2

17. 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.