9.0 x 10^1
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90 can be written in scientific notation as 9.0 x 10^1. This means that 90 is equal to 9.0 multiplied by 10 raised to the power of 1.
9 x 10^7
It is: 7.0*10^-4
It is a very huge number and would be expressed in scientific notation as 9.0*1090
It is 8.9*10^-5 in scientific notation