The radius of the earth's orbit is 45,000,000 meters. what is the number in scientific notation?

Scientific notation is always written as a number more than 0 but less than 10,( exg 4.5, 3.5, but not 12 or 84) times a 10 to the somthing power

so
45,000,000
we have to move the decimal place 7 places to the left to make the number less than 10 and more than 0 so
4.5 times 10000000 or
4.5 times 10^7
or on online program 4.5e+07