6.99 X 108
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All those zeros are superfluous in scientific notation but would reappear if you wrote out the number in standard notation.
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3.844 * 108
Express 2,750,389 in scientific notation.
The product of 12 and 4.2106 can be written as 5.05 × 101 in scientific notation.
It is 150 billion and can be expressed as 1.5*1011 in scientific notation
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