Whats the common difference in the sequence -4.3,-3.2,-2.1,-1

What is the length of bc ? enter your answer in the box.bc =

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?

What could explain what happened when the time was equal to 120 minutes