Answer:
The answer is in the included image
Answer: 
Step by step:

(Used a table of common angles)
Answer: 1 ticket = 70 cents.
Step-by-step explanation:
If you get 20 tickets for 14.00, then we have to divide 14 by 20.
14 ÷ 20 = 0.7, or 70 cents. Because of this, each ticket will cost 70 cents.
Answer:
7.87 years
Step-by-step explanation:
#First we determine the effective annual rate based on the 9% compounded semi annual;

#We then use this effective rate in the compound interest formula to solve for n. Given that the principal doubles after 2 yrs:

Hence, it takes 7.87 years for the principal amount to double.