-5, you never want the denominator to equal zero or else it doesnt exist!
x+5=0
x=-5
        
             
        
        
        
Letter A is the answer because 
4y = 15 - 3x
so y = 15/4 -3x/4
        
             
        
        
        
All parabolas?
explanation:
        
                    
             
        
        
        
The second attachment I solved in your another question.You may refer to that.
#1
Apply Pythagorean theorem
x²=10²-6²
 
        
                    
             
        
        
        
Answer:
Not quite sure what you are aiming for in this question; however, I guess that is true? A blind man wouldn´t simply rely on a lamp-post to get around.  I guess what is being said is that statistics should be used when it is useful? There are plenty of ways people can analyze that statement.
Step-by-step explanation: