The factor pairs of a number when multiplied give the original number.
Therefore, all the factor pairs of 28 are:

The correct choice is the first one
The land bridge (Bering strait) and the crossing from Canada
Answer: Your Answer is: -8/17
Keeping in mind that there are 5280 ft in 1 mile, and there are 60 minutes in 1 hr and 60 seconds in 1 minute, therefore 60*60 seconds in 1 hr, or 3600 seconds, then.
There are many possible answers.
10:12
15:18
20:24
25:30
30:36