All questions u may have to click the picture

1. u must simplify 3^2 first because the order of operations states that u have to do exponents before subtraction.

2. 12 - 3^2 = 81she subtracted the 3 first12 - 3^2 = 9^2 = 81...which is an incorrect answer

3. u do not divide before simplifying 3^2order of operations states that u have to do exponents before division

4. no(12 - 3)^2 order of operations states that u do parenthesis before exponents...so (12 - 3)^2 = 9^2 = 81

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X> -2 is the simplified version.