Answer :

ChancyDaigle
Three is the answer!!!
Liyuki
Use PEMDAS. (Parenthesis, Exponent, Multiplication, Division, Addition, Subtraction) to remember the order of operations.
Parentheses first. -3^2+(-15)+9
Exponent 9+(-15)+9
There's no M/S (multiplication/division)
A/S add and get 9+(-15)=-6
-6+9=3.

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