Question

How do you simplify and write `(1.0times10^-15)/(4.2times10^-7)` in scientific notation?

Answer 1

`2.38*10^-9`

Explanation:

How I usually answer questions like this I ignore the exponents first and divide the numbers as usual
`1.0/4.2=0.238`

Now I take care of the exponents since we're dividing you subtract the exponents
`-15-(-7)=-8`

So now we have
`0.238*10^-8`

We have to move the decimal back to make it proper scientific notation, so the answer is
`2.38*10^-9`