Something that is a billion starts off with 109. Then, 2.7 billion in scientific notation is 2.7 x 109.
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Assuming you mean billion*billion*billion = It is 1*10^27.
It is: 27,000,000,000,000,000 or 2.7*1016 in scientific notation
80 billion in scientific notation is: 8.000000e+10
100 billion in scientific notation is: 1.000000e+11
Four billion in Scientific Notation = 4 x 109