7 X 1011
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The zeros are superfluous, except in significant figures.
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It is Seven hundred billion = 700,000,000,000 or as 7.0*1011 in scientific notation
700000000000-9000000000000000000 = -8999999300000000000
It is 8.9*10^-5 in scientific notation
It is "(scientific notation)".
This number in scientific notation is 9.8x10-5.