To evaluate \( 0.0899 + 3.31 \times 10^{-3} \), we first need to convert both numbers to the same decimal format or scientific notation.
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Convert \( 3.31 \times 10^{-3} \) into decimal form: \[ 3.31 \times 10^{-3} = 0.00331 \]
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Now we can add \( 0.0899 \) and \( 0.00331 \): \[ 0.0899 + 0.00331 = 0.09321 \]
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Next, we express \( 0.09321 \) in scientific notation. To convert it: \[ 0.09321 = 9.321 \times 10^{-2} \]
Thus, the final answer in scientific notation is: \[ \boxed{9.321 \times 10^{-2}} \]