I need help plz and thanks I’ll give brainliest if you answer right

Show me how you find y and determine what y is you i appreciate it : )

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?

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer