Answer: B. 
Step-by-step explanation:
The confidence interval for the population mean is given by :-

Given : Sample size : n= 100
Sample mean : 
Standard deviation: 
Level of confidence = 0.95
Significance level : 
Critical value : 
Then, 95% confidence interval for the population mean will be :-

I am guessing the answer is C.
since X seem to be a full 90-degree angle, and y is also 45 degrees.
Answer:
It is C, the metric system
Answer:
The third one
Step-by-step explanation:
When we multiply two negative numbers, one always gets a positive number.
(-)×(-)= +
Hope it helps