Any one be my sister​

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

The ratio of wooden bats to metal bats in the baseball coach’s bag is 2 to 1. if there are 20 wooden bats, how many metal bats are in the bag?

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles