Well first add up all the numbers of marbles (which is 34 in total) and divide it by the number of black marbles. 
(which should give you 8/34)
Then simplify the fraction and you should get 4/17
        
                    
             
        
        
        
Answer= H (-1, -4) 
Explanation= 6(-1) - 5(-4) = 14 
 (-6) + (20) = 14
 14=14 * it works ! 
GOODLUCK!
        
             
        
        
        
1. Irrational 
2. Irrational 
3. Rational
4. Rational
        
                    
             
        
        
        
Step-by-step explanation:
This is a probability related problem. 
   Probability is the likelihood of an event to occur; 
     Pr = 
The sample space here is from 1 to 25 which is 25
A. 
Pr of a card marked 8; we have just 1 possible outcome;
        Pr(8)  = 
 
B. 
Pr  of drawing a card that is a multiple of 5; 
     Multiples of 5 = 5, 10, 15 and 25 
      Pr (multiples of 5) = 
 
C. 
Pr of drawing a card with odd numbers: 
           Number of odd numbers between 1 and 25  = 13 
      Pr(odd numbers) = 
 
D. 
Pr of drawing a number with square number on it;
         Square numbers between 1 and 25  = 1, 4, 9, 16 and 25
   Pr(square numbers) = 
   = 