<Tr> <Td> 6,720,000,000 </Td> <Td> 7009672000000000000 ♠ 6.72 × 10 </Td> </Tr> <Tr> <Td> 0.2 </Td> <Td> 6999200000000000000 ♠ 2 × 10 </Td> </Tr> <Tr> <Td> 0.000 000 007 51 </Td> <Td> 6991751000000000000 ♠ 7.51 × 10 </Td> </Tr> <P> In scientific notation all numbers are written in the form </P>

The exponential 10^1 is equal to which decimal number