"Billion" usually has the meaning "thousand million". So 7 billion = 7 x 109.
Traditional UK usage has billion meaning "million million". This in exponential form (scientific notation) is 7 x 1012.
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The exponential form of one billion is 1*10^9.
1011
5.0 × 109
The exponential form of this question (7x7x7x7x7x7x7) is = 7^7 (7 to the power of 7)
1.0 × 109