4.50+4.50=9.00=9
+
2.39+2.39=4.78
+
1.99
=
15.77
15.77-25=-9.23
        
             
        
        
        
It follows from the definition of the binomial coefficient:

So we have

That is,  gets absorbed into the numerator's factorial, and we introduct
 gets absorbed into the numerator's factorial, and we introduct  into the denominator. Now,
 into the denominator. Now,  , so we get
, so we get

as required.
 
        
             
        
        
        
50 is the value cause 20 is 40 of the percent, 20+20 is 40 now you made it into 80%.20% is remaining so add 10.
        
             
        
        
        
Answer:
 this should be right
Step-by-step explanation:
angle a is 60 degrees