Which equation does not represent a function?

Brook states that the distance on the line is 4 units. caleb states that the whole line does not have a distance because it continues on forever. vivian states that the line is 6 units long. which distance did brook measure? which distance did vivian measure?

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

If eh = hg and hg=16, find the diameter of k