The answer is 7. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
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9 + -2 = 7
3 raised to negative 2 would be -9 plus 6 to the negative 1 which is -6 so -9+-6=-15
7 + (-9) = 7 - 9 = -2
The sum of 9 and -11 is -2.
The sum of +9 and -11 is -2.