It always helps to write the number fully out to convert to scientific notation.
13.7 billion is the same as 137,000,000,000. When we move our decimal point to make it 1.37 x 10 - we moved 11 spots to the left (positive) so our scientific notation would be: 1.37 x 1011
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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
6.32 billion in scientific notation is: 6.32 x 109
It is: 7.5*10^9 = 7.5 billion in scientific notation