Add and subtract and add fraction with divided

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?

Which of the following is not a subset of {1,2,3}?

Is there an x intercept in the equation 60*1.15^x