Advanced Math practice question

Answer: 10

18 − 8 = 10.

Common wrong answers

If you answered 2

2 uses 9 − 2w² with w = 2 wrongly, giving 9 − 8 = 1, or another slip; the value is 10.

If you answered 14

14 uses 9w − 2w, not squaring.

If you answered 26

26 adds 8 instead of subtracting.

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