To solve the expression \( 3^2 + (10 - 15) \), we follow the order of operations:
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Calculate \( 3^2 \): \[ 3^2 = 9 \]
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Calculate \( 10 - 15 \): \[ 10 - 15 = -5 \]
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Now, add the two results together: \[ 9 + (-5) = 9 - 5 = 4 \]
So, the value of the expression \( 3^2 + (10 - 15) \) is \( 4 \).