Anumber is randomly selected from {15, 16, 17, 18, 19, 20}. a is represented by the event that the number picked is less than or equal to 16. what is the probability of the complement of event a? 1/6 1/3 2/3 5/6

Consider the line y = -3/-2 x +6. find the equation of the line that is perpendicular to this line and passes through the point (-9,-3). find the equation of the line that is parallel to this line and passes through the point (-9,-3).

The graph of y = ax^2 + bx + c is a parabola that opens up and has a vertex at (0, 5). what is the solution set of the related equation 0 = ax%2 + bx + c?

If the value of cos330°is√3/2 then find cos 165°.