Question

Which of the following correctly expresses .0000045 in scientific notation
1).4.5 x 10-6
2).4.5 x 106
3). 45 x 10-7

Answer 1

1, just count how many times you have to move the decimal.

Answer 2

Idk how to do that that's why I'm asking this question -_-

Answer 3

So for example, 0.0045 requires you move the decimal 3 places to the right to get 4.5 (x 10-3) is the result.

Answer 4

4.5x10^-6