Answer:
width = 1 1/3 inches
length = 9 2/3 inches
Step-by-step explanation:
let 'w' = width
let '7+2w' = length
P = 2l + 2w
22 = 2w + 2(7+2w)
22 = 2w + 14 + 4w
8 = 6w
w = 4/3 or 1 1/3
substitute 1 1/3, or 4/3, to find length:
l = 7 + 2(4/3)
l = 7 + 8/3 or 9 2/3
 
        
             
        
        
        
In the first series, the summation applies to the whole (2n+3) inside 
the parentheses, so the 3 gets summed up 5 times.
But in the second one, the summation only applies to the 2n , so 
the 3 is only added after the summation is finished.
The difference between five 3s the first time and one 3 the second time 
is your 12 .
        
                    
             
        
        
        
Answer:
1,2,5
Step-by-step explanation:
 
        
             
        
        
        
Should be... x ÷ -1.5 = 21
 
        
                    
             
        
        
        
These cannot be solved.- 3 unknowns require 3 equations