In Exercises 33–36, determine the coordinates of the points P, Q, and R in each figu...

In Exercises 33–36, determine the coordinates of the points P, Q, and R in each figure; give an exact expression and also a calculator approximation rounded to three decimal places. Assume that each dashed line is parallel to one of the coordinate axes. (In Exercise 36, note that the line is y = x/2 rather than y = x.)