Selection B is the best choice.
_____
Ms Levy paid for 1 hotel room at ~ $200, and 2 tickets at ~ $100 each.
Answer:

Step-by-step explanation:
Given

-- City C
--- City K
Required
Determine the 90% confidence interval
This is calculated using:

Calculating 




For a 90% confidence level, the z-score is 1.65. So:

Calculating the standard deviation 

So:


So:


Answer:
8/21
I don't think that it can be simplified further....
I think 90 degrees but not 100 percent sure
All real solutions
Everything cancels out once you multiply the top equation by two.
0 = 0 which means all real answers.
I hoping you meant question 3. Good luck!