Because both positive and negative values have<span> a positive </span>absolute value.
        
                    
             
        
        
        
Answer:
Therefore, the exact value of Tan 60 degrees is √3. We can also derive the values of tan 0°, 30°, 45°, 90°, 180°, 270° and 360° in the same way
 
        
                    
             
        
        
        
The leg rule is hypotenuse/leg and the altitude rule is side 1/altitude=altitude/side 2
        
             
        
        
        
Answer:
I am not the best in this type of math, the best thing I can do is help you. 
You see that there is a pattern in the chart? X adds 2 every column, and Y adds 4 every column. 
I believe the slope simplified is 2/1, if you are following y/x. If not, then the other way around.  
Unfortunately, I can't help you with the rest of the problem, but I hope you can get a good idea of what your supposed to do. 
Have a good day.