Helll me on this question asap i’ll try to put graphs

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?

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

Add the fractions and simplify 1/2+ 1/3