Which of the following graphs represents a function that has a positive leading coefficient?

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

If value of cos330° is √3/2 then find tan165°.

Select all of the following expressions that are equal to 2.5.