I would say B. The second picture, it's slightly less than a 90 degree angle, so it looks like it should be that.  
Hope this helps!! :)
        
             
        
        
        
Answer:

Step-by-step explanation:

 
        
             
        
        
        
Since there are three black shirts and 7 blue shirts, he has a 3/10 chance of picking a black.
        
                    
             
        
        
        
Answer:
10 power 10 4/4 
 10 power 1/4 
 power 3 root 10 power 4 
 4 ROOT 10
Step-by-step explanation:
 
        
             
        
        
        
SOLUTION 
The question simply means that we should find the sum to infinity of the geometric series. 
The formula of sum to infinity of a geometric serie is given by 

Where 

So, this becomes 

Therefore, option b is the correct answer