The answer is: [B]: 1.263 10³
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The "10-cubed"; or, "10³ " , is an indication of needing to move the decimal point three spaces to the right to get the answer is "non" scientific notation.
In proper scientific notation, we take the smallest non-zero integer, followed by a decimal point, and any remaining number, and then write "times 10^(insert appropriate number of decimal places.
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As such: 1,263 = 1.263 10³
(or, 1.263 × 10-cubed).
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