Answer:
12 months 
Step-by-step explanation:
Given that:
Mario:
12 stamps per month
Since January 
Karen :
18 stamps per month
Starts on july
Number of stamps collected by Mario till the end of June :
12 * 6 = 72 stamps 
For Mario :
72 + 12x
For karen:
18x
Where x is the number of months after karen starts :
Equate both equations
72 + 12x = 18x
72 = 18x - 12x
72 = 6x
x = 72/6
x = 12
After 12 months 
Number of months after karen starts, will they have same amount of stamp 
 
        
             
        
        
        
Answer:
rectangle
Step-by-step explanation:
Perimeter of 20 feet
rectangle (square is technically a rectangle):
sides 5 and 5
5*5 = 25ft²
Circle:
20/(2π) = 3.18309...
3.1809...²π = 31.831ft²
Max area of rectangle (i.e. square) has a smaller area than a circle.
 
        
             
        
        
        
X/3/2/6/4
2/6/4/12/4
12/36/24/72/48
14/42\28/84/56
21/63/42/126/84
        
             
        
        
        
75/8  or 9.375 
mathway is a good helper sometimes 
        
                    
             
        
        
        
Answer:
I'm working on that too and I don't get it