10.9 billion is written as 10,900,000,000
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It is: 4,200,000,000 or as 4.2*109 in scientific notation
It is: 1,226,000,000 or as 1.226*109 in scientific notation
It is: 3,850,000,000 or 3.85*109 in scientific notation
1,000,000,000 (US or short scale, 1 x 109)
If by billion you mean an American billion (109), 1,900,000,000. If you mean a British billion (1012), put 3 more 0s on to the end.