Answer- 
The number is 5 
Explanation-
let the number be x
according to the condition 
2x-(x-7)= 12 
2x-x+7=12 
x+7=12
x+7-7=12-7 
x=5 
therefore the required number is 5
        
                    
             
        
        
        
The correct solution: 4x^2 -27x +167 - 996/(x+6)
Step-by-step explanation:
 
        
             
        
        
        
The one that isn’t rationals is B.
        
             
        
        
        
Answer:
x=24.621
Step-by-step explanation:
tan(72)=x/8
tan(72)×8=x
x=24.621
 
        
             
        
        
        
Answer: 0
Step-by-step explanation: 
So the slope of a line is equal to rise over run, or the change in x over the change in y. We can solve for the change in x and the change in y by finding their differences. For the math, we use the formulas y2 - y1/x2 - x1. Filling in this formula we get, (5-5)/(3-13), which is equal to 0/10. Because 0 divided by anything is 0, the answer here is 0.