Pls help me with this!

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?

Rationalize the denominator- 12x/√x-10

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?