Answer:
295.68
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
Im pretty sure the 3rd choice on #2 is an irrational number...
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
z≈3.16
p≈0.001 
we reject the null hypothesis and conclude that the student knows more than half of the answers and is not just guessing in 0.05 significance level. 
Step-by-step explanation:
As a result of step 2, we can assume normal distribution for the null hypothesis
<em>step 3:</em>
z statistic is computed as follows:
z= where
 where 
- X is the proportion of correct answers in the test ( ) )
- M is the expected proportion of correct answers according to the null hypothesis (0.5)
- p is the probability of correct answer (0.5)
- N is the total number of questions in the test (40)
 z= ≈ 3.16
 ≈ 3.16
And corresponding p value for the z-statistic is p≈0.001.
Since p<0.05, we reject the null hypothesis and conclude that the student knows more than half of the answers and is not just guessing in 0.05 significance level. 
 
        
             
        
        
        
From the given picture, we can see that 2 sides are congruen, then the given triangle is an isosceles triangle. In this triangle the base angles are congruent, so we can draw the following picture:
Now, since interior angles of any triangle add up to 180 degrees, we have

By combining similar terms, we get

Then, x is given as

Therefore, the answer is x=90 degrees