Question

What is the distance between a line that has endpoints at (1,5) and (1,-5)?

Answer 1

Since the x values (1) and (1) are the same, we just have to worry about the (5) and (-5)

the distance between a (5) and (-5)
would be  (5) - (-5)
which is equal to   (5) + (5) = 10

therefore your answer would be C. 10

note that distance should always be a positive number