7.8 x 10^-4 / 3.9x 10^8?

Question

7.8 x 10^-4/ 3.9 x 10^8

Answer 1

That's equal to the product of 7.8/3.9 and 10^(-4)/10^8.

When you write it that way, the first fraction equals 2 and the second fraction equals 10^(-12).

So the answer is 2 x 10^(-12).