1) since the probability of garden is 3/20, the total number of cards has to be a multiple of ten. 10 and 20 do not work, but 30 does. number 1 is 30
2) since the odds are 2/5, they're had to be 2/5*30=12
3) since the odds are3/10, there are 3/10*30=9
4)
        
                    
             
        
        
        
Answer:
D. 4
Step-by-step explanation:
Terms are separated by addition and subtraction signs
 
        
             
        
        
        
Answer:
6
Step-by-step explanation:
 3/4 ÷ 1/8
Copy dot flip
3/4 * 8/1
Rewriting
3/1 * 8/4
3/1 * 2/1
6
 
        
                    
             
        
        
        
Answer:
a) 910
b) 828100
c) 144320
Step-by-step explanation:
 a. ∑y 
This is the sum of all values of y. So

 b. (∑y)^2 
This is the square of the sum, so the square of 910, that we found in the previous item.
910² = 828100
 c. ∑y^2
This is the sum of the squares of each amount spent. So
