4.752 x 109
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The standard number 0.09 in scientific notation is: 9 × 10-2
It is one of the great ironies of Mathematics that "standard" is not standard. In the US, standard notation is a number, like 953, which would be written in scientific notation as 9.53 x 10^2 In Britain, scientific notation is also known as "standard form."
0.9 in scientific notation is 9.0*10*^-1
It is: 3.992*10^11 in scientific notation
28.6 is the standard notation. The standard form(also called scientific notation) is: 2.86 × 101