Select the correct answer.

A circle with 4 points P, Q, M, and N on its circumference and a point S inside it. A line increases from Q through S to P and a line decreases from M through S to N. M S is 2 x plus 4, S N is x minus 2. S P is x, S Q is x plus 7.
Figure not drawn to scale

Consider the given circle with chords MN and PQ intersecting at point S. What is PQ?
A. 23
B. 21
C. 18
D. 9

1 answer

B. 21