Answer: 
 
Step-by-step explanation:
Given
Equations are  and
 and 
take 

Put the value of y in another equation 

Put the value of x in y

Hence,  
 
 
        
             
        
        
        
20/36 reduced is 5/9. hope this helped!  :)
        
                    
             
        
        
        
Answer:
2912
Step-by-step explanation:
Your question wording is a little confusing but here's the steps:
She drinks 56 glasses of water each week.
There's 52 weeks in 1 year.
56 times 52 = 2912.
 
        
             
        
        
        
Answer:
n = 12 nickels
d = 11 dimes
q = 7 quarters
Step-by-step explanation:
.05n + .1d + .25q = 3.45
n + d + q = 30
n = q + 5
n = 12
d = 11
q = 7