Answer: C. 
Step-by-step explanation:
The confidence interval for difference of two population mean is given by :-

Given : Level of significance : 
Then , significance level : 
Critical value : 


Hence, a 99% confidence interval for the difference between the mean wait times of everyone who rode both rides 
First can you change
2x + y = -12
To have y as the subject
Looks like y = ???
it should be rounded to 30.1
It will take about 16.66 months for the investment to double.
Hope this helps.
Answer:
27 miles.
Step-by-step explanation:
if you count from the 15 miles from the east to the 12 miles in the west, it would add up to 27. hope this helped