Answer:
1.75
Step-by-step explanation:
0.009÷0.004- =
=
2.25-0.5=
1.75
 
        
             
        
        
        
Answer:
ok
Step-by-step explanation:
yeah
 
        
             
        
        
        
440- 2x= 244 // simplify the equation given
        
             
        
        
        
Answer:
58.33 lbs.
Step-by-step explanation:
There are already 25 lbs of alloy of copper
Of this 25 lbs, 20% is pure i.e. copper content = 25(0.5) = 5lbs.
Now available is 
Copper      Other metals
5 lbs                20 lbs
Let x lb of 30% copper is added.
Then new alloy will have 5+0.3x lb copper in total of 25+x lbs
Percentage pure = 
Simplify to get
 
Hence answer is 58.33 lbs should be added.
 
        
                    
             
        
        
        
Answer:
16500
Step-by-step explanation:
If it leaks 75 mL a minute you multiply that by the 220. Then you get 16,500