20. Please help. What is the length of PD⎯⎯⎯⎯⎯⎯⎯⎯?

Answer:
The correct answer is 6, so the first option.
Answer: PD = 6
Step-by-step explanation:
PD = PB + AB = 12
When two secant lines intersect each other outside a circle, the products of their segments are equal. This is:
PB x PA = PD x PC
7 x 12 = PD x 14
PD = 7 x 12 / 14
PD = 6