The answer to your question is b. 2
        
                    
             
        
        
        
Answer: multiply each side then multiply the answer by 2
Step-by-step explanation:
 
        
             
        
        
        
Price after 9% increased 1800
Price before increase 1800-9%*1800
 =1638
        
             
        
        
        
Answer:

Step-by-step explanation:
To solve this problem, we can use the area of a circle formula as shown below:

<em>A = area</em>
<em>r = radius</em>
<em />
First we need to find the radius. 
The radius is half of the diameter. For this problem, the radius is going to be 3.
Now, plug the values into the equation:


The window's area is 