Well, for 4 I believe you must divide 2/4 by 100 to make it a decimal, then divide the decimal by the 5. :) Hopefully that is correct!
        
                    
             
        
        
        
Combine like terms
-7y² + 6y² - 2y² = -3y²
4y + (-5y) - (-9y) = 4y - 5y + 9y = 8y
9 + 9 - (-2) = 9 + 9 + 2 = 20
-3y² + 8y + 20 is your answer
hope this helps
 
        
             
        
        
        
Answer:
0.027027
Step-by-step explanation:
2 x 19= 38
38C2=703
19/703=0.027027
You 
 
        
             
        
        
        
Answer:
2x^(10)y^(12)
Hope This Helps!   Have A Nice Day!!
 
        
                    
             
        
        
        
Answer:
11,703 feet
Step-by-step explanation:
Since absolute value is never negative, just add the distances to get the full span. Just think of above sea level as positive and below sea level as negative.