# Question #27d03

Nov 16, 2016

$4 \times {10}^{- 7}$

#### Explanation:

$0.0000004$

Scientific notation is a number between 1 and 10 multiplied by 10 to a power.

We can see that the number between 1 and 10 will be $4$. To find the exponent for which 10 will be the base, count the decimal places from the $4$.

$= 4 \times {10}^{- 7}$