Answer:
D. 13 1/2 
Step-by-step explanation:
2/3 x -2 = 7
2/3 x -2 + 2 = 7 + 2
2/3 x = 9
x = 9 (3/2)
x = 27/2
x = 13 1/2
 
        
             
        
        
        
Answer:
There are 23 dimes in the box
Step-by-step explanation:
Let nickels=n
Let dimes=(35-n)
Equation: 0.05n+0.10(35-n)=2.90
Multiply both sides by 100: 5n+10(35-n)=290
-5n+350=290
-5n=-60
n=12
35-12=23
Therefore, there are 23 dimes in the box
 
        
             
        
        
        
Step-by-step explanation:
.19 = 19/100
.864 = 86.4/100
.5348 = 53.48 /100 
I multiplied the decimal by 100 to get what it was before which is the same as moving two decimal places to the right and divided by 100
if any confusion ask
 
        
                    
             
        
        
        
I need help to find the root?
 
        
        
        
I guess that is 1:10 
Hope ur help !;(