Help please Due tomorrow

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?

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

What expression is equivalent to log3(x+4)