Area = width * height
since the window is 20 inches higher than the width:
width +20 = height 
640 = width * width+20
640 = width^2 +20*width
width^2 +20*width - 640 = 0 
width = 17.203
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Double Check
if width = 17.203 then height = 37.203
area = 17.203 * 37.203 = 640 square inches Correct!! 
        
             
        
        
        
5/6 im guessing ? Im pretty sure its 5:6
        
             
        
        
        
Answer:
1 C
2 D and B
3 46
Step-by-step explanation:
hope that helps if not sorry<3