To multiply numbers in scientific notation, you multiply the coefficients (the numbers in front) and then add the exponents.
For the numbers you provided:
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Coefficients: \( 5.5 \times 2.2 = 12.1 \)
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Exponents: \( 10^{4} \times 10^{-8} = 10^{4 + (-8)} = 10^{-4} \)
Now, combining these results gives us:
\( 12.1 \times 10^{-4} \)
To express this in proper scientific notation, we need the coefficient to be between 1 and 10. So we adjust \( 12.1 \) to \( 1.21 \) and increase the exponent by 1:
\( 12.1 \times 10^{-4} = 1.21 \times 10^{-3} \)
Thus, the correct answer in scientific notation is:
1.21×10−3