Usually you are given more information about the rectangle such as distance of length in terms of width.
You know that the formula for perimeter is
P=2(l+w) 
Substitute p and the other values to find width.
Hope I helped :)
        
             
        
        
        
15 - 9 = 6 6÷3=2 X=2
You do the inverse operation
        
             
        
        
        
Answer:
C) -7/3
Step-by-step explanation:
m=(y2-y1)/(x2-x1)
m=(9-(-5))/(-2-4)=(9+5)/-6=14/-6
simplify -14/6 to -7/3
 
        
             
        
        
        
Answer:
$120.00
Step-by-step explanation:
2000/100 = $20 = 1% 
20x12 = $240 = annual intrest = 12m 
June 15 - December 15 = 6m 
240/2 = $120 for half a year intrest!