It can be solved by factoring or taking the root of both sides. 
x= 2 radical 3. and -2 radical 3
        
             
        
        
        
Answer:
There is no sufficient evidence to support the claim that the bags are underfilled
Step-by-step explanation:
We are given;
n = 27 bags
Sample mean;X = 402 gram
Population mean;μ = 404 gram
Variance = 676
We know that, standard deviation(σ) = √variance
Thus;
σ = √676
σ = 26
The hypotheses are;
Null hypothesis; H0: μ = 404
Alternative hypothesis; HA: μ < 404
Let's find the z-score from the formula;
z = (X - μ)/(√σ/n)
z = (402 - 404)/√(26/27)
z = -2.04
From the z-distribution table attached, we have a p-value of 0.02068
This is less than the significance value of 0.01 and thus we will reject the null hypothesis and conclude that there is no sufficient evidence to support the claim that the bags are underfilled
 
        
             
        
        
        
Answer:
It will take 30 minutes!
Hope this helps! :D
Step-by-step explanation:
 
        
                    
             
        
        
        
B2-7b+12=0 
(b-3)(b-4)=0
b= 3 or 4