How do you solve this to find the vertex f(x) = x^2-5x+4

What could explain what happened when the time was equal to 120 minutes

The verbal translation for the difference of m and 7 increased by 15

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?