You are multiplying 2 to each term each time.
-40 is the 4th term
-40 x 2 = -80
-80 x 2 = - 160
-160 x 2 = -320
-320 x 2 = -640
-640 x 2 = -1280
-1280 x 2 = -2560
-2560 x 2 = -5120
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-5120 is your 11th term.
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hope this helps
 
        
                    
             
        
        
        
Answer:
15
Step-by-step explanation:Addentitive property states that any number added with 0 is the original number. so, 15+0=15
 
        
             
        
        
        
The answer is 
x =<span> <span><span>−3/</span>17</span></span>