To solve this problem you must apply the proccedure shown below:
 1. You have the following information given in the problem above:
 -  The<span> room has square dimensions and it has been built with two pieces of sheetrock, a smaller one and a larger one. 
 2. Therefore, let's call
 x: the smaller one.
 y: the larger one.
 3. Then, you have that the lenght of the wall is the sum of the smaller one and the larger one:
 x+y
 4. So, the area of the room is:
 (x+y)(x+y)
 (x+y)</span>²
 Therefore, the answer is: (x+y)²
        
             
        
        
        
2800-2100=700
2800/700=4
4% decrease
        
             
        
        
        
Two equivalent fractions would be 8/10
and 12/15<span />
        
             
        
        
        
Answer:
![r= [(\frac{A}{2500}) ^\frac{1}{2} -1]](https://tex.z-dn.net/?f=r%3D%20%5B%28%5Cfrac%7BA%7D%7B2500%7D%29%20%5E%5Cfrac%7B1%7D%7B2%7D%20-1%5D)
Step-by-step explanation:
Given data
Principal = $2500
time t= 2 years
Required
the rate r
Given the expression for the balance 2500(1+r)^2 
Hence

we can make r subject of formula
![r= [(\frac{A}{P}) ^\frac{1}{t} -1]](https://tex.z-dn.net/?f=r%3D%20%5B%28%5Cfrac%7BA%7D%7BP%7D%29%20%5E%5Cfrac%7B1%7D%7Bt%7D%20-1%5D)
![r= [(\frac{A}{2500}) ^\frac{1}{2} -1]](https://tex.z-dn.net/?f=r%3D%20%5B%28%5Cfrac%7BA%7D%7B2500%7D%29%20%5E%5Cfrac%7B1%7D%7B2%7D%20-1%5D)
Hence, for any value of A, we can find the rate using the expression above