Answer:
-20
Step-by-step explanation:
 
        
                    
             
        
        
        
T(n)=6-1=5
that means all terms are 5 because n does not appear on the right hand side.
However, if T(n)=6n-1, then
first term = T(1)=6(1)-1=5, 
but second term T(2)=6(2)-1=11...
        
             
        
        
        
-- The two sides of a right <u>angle</u> intersect and make the angle. 
So do the sides of any other angle. So they can't be parallel.
-- No two sides of a right <u>triangle</u> ... or any other triangle ...can be parallel.
        
             
        
        
        
Using the quadratic formula