The discriminant is

which is 0.
Since the discriminant is 0, there is only one real solution.
6 + y × 9 (the x is a times sign btw)
We dont know how many people were originally in the group.
Answer:
No
Step-by-step explanation:
They are independent iff:
P(F & D) = P(F) × P(D)
15.278/100 = (55/100) × (27.778/100)
0.15278 = 0.125279 (false)
Therefore, not independent