Question

10^-9

http://gyazo.com/60e64078951b55268a87a53b2144c62a

Answer 1

First step: Get rid of that negative exponent.
10^-9 = 1 / (10^9)

Answer 2

1/10^1 = 0.1
1/10^2 = 0.01
1/10^3 = 0.001
...
...
Now you can probably figure out 1 / 10^9

Answer 3

A negative exponent means that you move the decimal point to the left.

Answer 4

\(\bf \large a^{-n} = \cfrac{1}{a^n}\)