The square root of 15 is irrational.
 
        
                    
             
        
        
        
What do you want the answer to? Once you update your question, I'll edit my answer!!! 
 
        
             
        
        
        
Answer:
y = x + 6.
Step-by-step explanation:
y = mx + c  where m = the slope of the line and c is the y-intercept.
So here m = 4/4 = 1 and c = 6, so it's:
y = 1x + 6.
 
        
             
        
        
        
Answer: 1 5/12
Because 2/3 + 3/4 = 17/12, if you simplify that it would be 1 5/12
 
        
             
        
        
        
Answer:
   y = 0.1(4^x)
Step-by-step explanation:
An exponential function can be written as ...
   y = a(b^x)
where 'a' is the y-intercept, and 'b' is the ratio of terms with consecutive x-values.
The table tells us a=0.1, and b=0.4/0.1 = 4. The equation is ...
   y = 0.1(4^x)