Answer:
1. Expression can be rewritten as
and 
2. The expression for total cost for a visit =
and the Total Cost to visit the fair for 20 tickets is 
3. B. 
Step-by-step explanation:
1. Solving for first Question
Given expression are
and 
Solving equation we get,

Expression can be rewritten as
and 
2. Solving for 2 Question
Given
Fixed cost of carnival = 
Additional Cost per ticket for food and ride = 
represents number of tickets.
Total cost to visit carnival = Fixed cost of carnival + Additional Cost per ticket for food and ride
Number of tickets = 
algebraic expression to represent the total cost for a visit to the carnival = 
Now Number of tickets sold n = 20
Total cost to visit carnival= 
Total Cost to visit the fair for 20 tickets is 
3. Solving for 3 question.
Given :

Solving Above equation we get:

Hence the answer is B. 