I think It’s A took the test
        
                    
             
        
        
        
Answer:
22
Step-by-step explanation:
Find f(-3) :
f(x) = x² + 2x for x ≤ -3
That means for those values of x, less than or equal to -3, this is the function.
So, f(-3) = (-3)² + 2(-3) = 9 - 6 = 3
Now, f(-1) :
From the given data, we see it is: f(x) = 2  
We take this because -1 lies between -3 and 4.
Now, f(-1) = 2  
  =>  
For f(4) :
Clearly, the function is:  
 
Therefore, <u>f(-3) + f(-1) - f(4) = 3 + 18 - (-1) = 3 + 18 + 1 = 22.</u>
 
        
             
        
        
        
Answer:
With alpha 0.95 and 8 degrees of freedom χ²= 2.73
And with alpha 0.05 and 8 degrees of freedom χ²=15.51
Step-by-step explanation:
The significance level ∝ = 1- 0.9 = 0.1
But we need the area of the middle so we divide this significance level with 2 
so that we get exactly the middle area .
Dividing 0.1/2= 0.05
So we will have two values for chi square 
One with  0.9 + 0.05 = 0.95 alpha and one with 0.05 alpha . This is because the chi square is right tailed.
So with alpha 0.95 and 8 degrees of freedom χ²= 2.73
And with alpha 0.05 and 8 degrees of freedom χ²=15.51
This can be shown with a graph.
 
        
             
        
        
        
Answer:
11 
Step-by-step explanation:
Substitute 3 for b 
23 - 4(3) 
Multiply 4(3) = 12 
23 - 12
Subtract 
23 - 12 = 11