Angle xyz is rotated 270 degrees counterclockwise about the origin to for angle x'y'z'

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Walter is to make cookies for a basketball tournament. he's made 15 cookies so far. his coach asked him to make at least 20 cookies but no more than 55. solve the inequality and interpret the solution. 20 ? x + 15 ? 55

The measure of angle theta is 3 pi over 2. the measure of its reference angle is pi /