Answer:
1. .85
10 to the first power is still 10 so 8.5/10 = .85
2. 2.4892
10 to the second power is 100 so move decimal left 2 spaces
3. .00128
10 to the thrid power is 1,000 so move decimal left 3 places
4. .80734
same as last
5. .041595
10 to the fourth is 10,000 so move decimal left 4
6. .000528
10 to the fifth is 100,000 so move decimal left 5
do 7&8 on your own
9. 12,000,000
the power is 9 so move decimal right 9 spaces
899.2
same thing move decimal right 2
so >
10. 46,020
move dec. right 4
70,000
move dec. right 4
so <
do 11 on your own
for 12-17 try to keep max 2 numbers to the right of the decimal is there are 3 or more numbers (other than zero) otherwise just one to the right
12. 42 x 10^3
since we removed three zeros to the left of the decimal we multiply by 10^3
13. 3.4 / 10^3
since we moved the decimal right 3 we divide 3.4 by 10^3 to get our original number.
do 14-17 on your own
Sorry I don't have time to help with 18-23 but I wish you the best of luck and have a great day!