Answer:
40
Step-by-step explanation:
The area of a rectangle is length*width. So, 200=8(1/2x+5). Dividing by 8, 25=1/2x+5. Subtracting 5, 20=1/2x, multiplying by 2, 40=x.
 
        
             
        
        
        
Answer:
x = 11
Step-by-step explanation:
By intersecting chords theorem:

 
        
             
        
        
        
The answer must have to be 40
        
             
        
        
        
2(x+3)=7(3x-2)
2x+6=21x-14