Find the greatest common factor of 9n and 7n^3

Ineed in figuring out this problem.

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min. if they did not stop driving, how many miles could kyle and elijah drove in a whole day? ? 1 day = 24 hours. plzzz write a proportion i will give you 100 points

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2 acellus answer