Please help me with part two

Which statement accurately explains whether a reflection over the x-axis and a 180° rotation would map figure acb onto itself?

Lindsay used two points, (x,y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

What is the the greatest common factor ?