Question

I need help please!

Which of the following expressions is correctly written in scientific notation?

0.22*10^-4 Is wrong.

Answer 1

7.31 ×
`10^(-2)`

Explanation:

a number expressed in scientific notation has the form

a ×
`10^(n)`

where 1 ≤ a < 10 and n is an integer

the only one fitting this description is

7.31 ×
`10^(-2)`