Order of Magnitude (I'm not quite understanding it)

Question

1) trying to 0.0000000734 estimated as the product with a single digit power of 10.*No multiple choice*

2) Trying to find the numbers that a greater than 7 x 10^-4 (Choose more than one answer type question)
- 8 x 10^-4 * my answer
- 9 x 10^-5 * my answer
- 4 x 10^-4
- 3 x 10^-2
- 7 x 10^-5 * my answer
3) best order of magnitude estimate for 29,300
- 10^4 * my answer
- 10^5
- 10^6
- 10^7
4) the best order of magnitude estimate for 0.0008
- 10^-3
- 10^-4 * my answer
- 10^-5
- 10^-6
Thanks! It's confusing to me :/

Answer 1

Online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown.

1) 7.34 * 10^-8

2) I assume the dashes in front of your choices are not meant to be negative signs.
10^-3 = .001
10^-4 = .0001
10^-5 = .00001
That should help you to choose.

3) Right

4) Right

Answer 2

.00000001

Answer 3

0.0000000734