A arc is the full circumference of a circle. (Fill in the blank and no files/links) plz help fas

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5