Question

how would write 0.2 x10 to the 6 power

Answer 1

that would be .2 x 10^6
bu the exponent should be a ;itt;e higher.
Think I'll make a graphic

Answer 2

\[.2 x 10^{6}\]

or \[2 x 10^{5}\]

Answer 3

Generally speaking it is common practice to have the number to the left of the 'x' be between 1 and 10.
So, the .2 x 10^6 is something you would rarely see.