Find the common difference of the arithmetic sequence -7, -3.5, 0, 3.5

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?

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12

With both problems. a.s.a.p directions on photo ^