Scientific Notation

The decimal form of $2.3\times {10}^{-5}$ is 

The scientific notation of the decimal number $45678.3\times {10}^8$ is 

The scientific notation of the decimal number $0.0000069\times {10}^{-2}$ is 

The scientific notation of the decimal number $0.0000069$ is 

The scientific notation of the decimal number $0.00006009$ is 

The distance between the sun and the planet Saturn is $1.4334\times a^b$, then $a+b=$ miles.