Answer:
Hello,
0,4925...
Step-by-step explanation:
A geometric random variable X with parameter p has probability function:

 
        
                    
             
        
        
        
I am pretty sure b. is right. This is because 87 is not prime
        
             
        
        
        
what do you need help on ? LMFA O
 
        
             
        
        
        
Answer:
D. 15
Step-by-step explanation:
Let the missing length be represented as x.
Thus:
(24 - x)/12 = x/20 => angle bisector theorem 
Cross multiply
20(24 - x) = x(12)
480 - 20x = 12x
480 - 20x + 20x = 12x + 20x
480 = 32x
480/32 = 32x/32
15 = x
Missing length = x = 15