If f(x) and g(x) are inverses, why is f(g(x)) = x ?

Jayda's house is located at (1, 5). she can walk in a straight line to get to cristian's house. a fast-food restaurant is located at (11, 0) and partitions the way from jayda's house to cristian's house by a ratio of 5: 1. find the coordinate of cristian's house. me . im a little stuck

What is the greater volume 72 quarts or 23 gallons

Does the point (1, sqrt 7) lie on circle shown.