Answer:
it c
Step-by-step explanation:
 
        
                    
             
        
        
        
2(-3-7)+5= <span>2(-10)+5= -20 + 5= -15
-15 is your final answer</span>
        
             
        
        
        
Answer:

Step-by-step explanation:
We are given the following in the question:
Sample size, n = 67
Variance = 3.85
We have to find 80% confidence interval for the population variance of the weights.
Degree of freedom = 67 - 1 = 66
Level of significance = 0.2
Chi square critical value for lower tail = 

Chi square critical value for upper tail = 

80% confidence interval:

Putting values, we get,

Thus, (3.13,4.91) is the required 80% confidence interval for the population variance of the weights.
 
        
             
        
        
        
The answer is 340
Explanation:
(g o f)(2) = g(f(2))
f(2) = 6(2)² = 24
g(f(2)) = g(24) = 14(24) + 4 = 336 + 4 = 340