Help fast 55 points please hurry

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?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)