Answer:
(21 + 11)2 = 64
So, I don't think teachers do this, but this is my way of doing it
Okay, so first, I divided 64 by 2 : 
64 ÷ 2 = 32
Then, I subtracted 11 from 32:
21 
Now, to check, just do the problem :
(21 + 11)2 = 64
       32 * 2 = 64
 
        
                    
             
        
        
        
Answer:
$700 for 35 people but if you want to add the fee it will be $850
 
        
             
        
        
        
X=-56/3 
multiply everything by 4 to cancel the fraction which will give you
3x+20=-36
then combine like terms to get
3x=-56
then divide to get x by itself to get
x=-56/3 
since this is a weird decimal, leave it as an improper fraction
        
             
        
        
        
(D) hope this helps kxjdndldjdkwpwnx
        
                    
             
        
        
        
Answer:
They will be picked up at 2  yards above sea level
 yards above sea level
Step-by-step explanation:
Let us consider sea level as reference and positions above sea level as positive and below sea level as negative.
With respect to this reference,
the position of top most point is +17  yards
 yards
and the position of lower most point is -13  yards
 yards
⇒ The position of midpoint is 
                                               = +2 
∴ <u>They will be picked up at 2  yards above sea level</u>
 yards above sea level</u>