Having trouble with these questions

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?

Find the zeros of the function. write the smaller solution first, and the larger solution second f(x)= (x+6)^2-49

Multiply. write your answer in simplest form. 3/8 x 5/7