The last one, since one depends on the other
        
                    
             
        
        
        
The answer is 8/10 and that simplified is 4/5
        
             
        
        
        
Answer: B.) -4+3
Step-by-step explanation:
The model represents "-4+3" because the blue arrow (top) stops at 3 which is a positive and the red arrow (bottom) stops at -4 which is a negative. 
 
        
             
        
        
        
Answer:
A
Step-by-step explanation:
Those two lines are the same. If you divide the second equation by 2, you will end up with the first equation. A system of linear equations cannot have two of the same line.
 
        
                    
             
        
        
        
Answer:  1.509
Step-by-step explanation:
The formula of Margin of Error for (n<30):-

Given : Sample size : n= 22
Level of confidence = 0.99
Significance level : 
Using the t-distribution table , 
Critical value : 
Standard deviation: 
Then, we have

Hence, the margin of error for a 99% confidence interval for the population mean =1.509