For the first one, you do need to divide. The division should be: 286/26, to find how many invitations can be printed each minute.
286/26=11
The answer is C. 11 invitations can be printed each minute.
For the second problem, Amy runs 1 mile every 7.5 minutes. To find how many miles she runs in an hour, divide 7.5 by 60:
60/7.5=8
The answer is G. Amy runs 8 miles in an hour.
I hope this helps :)