Question

409200000000 as a scientific notation

Answer 1

409,200,000,000

rule 1: place point where there is one non-zero number to the left of the decimal point

so that would be after 4

now simply count the number of spaces the decimal point have "moved" from the original number

this will be the exponent of 10

so

409,200,000,000

the point in the original equation was supposed to be at the very end of the number

like this

409,200,000,000.000

we put the decimal point after 4

and now we count

that will be 11 spaces

so our answer is

4.092 * 10^11