Answer:

Step-by-step explanation:

 
        
             
        
        
        
2912 is the population . when 12% is increase of the Ann's population
        
                    
             
        
        
        
I am in my kitchen if and only if i am at home 
not 100% right
        
                    
             
        
        
        
Let dimes = d and quarters =q
D + q = 50
D= 50-q
0.10d + 0.25Q = 7.70
Replace d with 50-q:
0.10(50-q) + 0.25q = 7.70
Simplify:
5 -0.10q + 0.25q = 7.70
5 + 0.15q = 7.70
Subtract 5 from both sides:
0.15q = 2.70
Divide both sides by 0.15:
Q = 2.70 / 0.15
Q = 18
D = 50-18 = 32
There are 32 dimes and 18 quarters