28,000 + 3,000x = 30,000 + 2,800x
3,000x - 2,800x = 30,000 - 28,000
200x = 2,000
x = 2,000/200
x = 10....after 10 yrs, company A and company B will be the same
        
             
        
        
        
Answer:
your answer is 91 over 5
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer 
Find out the original side length of the square .
To prove
Let us assume that the original length of the square be x.
Formula

As given
The dimensions of a square are altered so that 8 inches is added to one side while 3 inches is subtracted from the other.
Length becomes  = x + 8
Breadth becomes = x -3
The area of the resulting rectangle is 126 in²
Put in the formula
(x + 8) × (x - 3) = 126
x² -3x + 8x -24 = 126
x ²+ 5x = 126 +24
x² + 5x - 150 = 0
x² + 15x - 10x - 150 = 0
x (x + 15) -10 (x +15) =0
(x + 15)(x -10) =0
Thus
x = -15 , 10
As x = -15 (Neglected this value because the side of the square cannot be negative.)
Therefore x = 10 inches be the original side of the square.