Answer:
a) P value = 0.0013
b) No, it is not plausible that the silicon content of the water is no greater than it was 10 years ago
Step-by-step explanation:
The null hypothesis here is “Mean is equal to 5” while alternate hypothesis is that “Mean is greater than 5”
Given  
Mean = 5, x’ = 5.4 and sigma = 1.2 and n = 85
Z = x-u’/sigma/sqrt n
Substituting the given values, we get –  
Z = 3.02
A)	P value = 0.0013 which is less than 0.05 and thus we will reject the null hypothesis
B)	There is enough evidence to reject the null hypothesis  
 
        
             
        
        
        
I think the answer might be 6p^2+3p-63
        
             
        
        
        
3/5 - 2/5 = 1/5
I hope that helps!
        
                    
             
        
        
        
Answer:<-26, 26>
Step-by-step explanation: <4(-5), 4(2)> and
 <3(-2), 3(6)>
<-20, 8> and <-6, 18>
Now add <(-20+(-6)), (8+18)>
<-26, 26>
 
        
             
        
        
        
B because your allow to ship according to the sample