Answer:
3 cups of water
Step-by-step explanation:
 
        
                    
             
        
        
        
Given:
Consider the given function:

To prove:

Solution:
We have,

Substituting  , we get
, we get




Substituting  , we get
, we get




Substituting  , we get
, we get




Using the algebraic formula, we get
 
          ![[\because b^2-a^2=(b-a)(b+a)]](https://tex.z-dn.net/?f=%5B%5Cbecause%20b%5E2-a%5E2%3D%28b-a%29%28b%2Ba%29%5D)

 [Commutative property of addition]
               [Commutative property of addition]
Now,




Hence proved.
 
        
             
        
        
        
B: 2 and 1/6.
Tricky one if you rush through, its meant to SEEM complicated, like a lot of math questions.
        
             
        
        
        
Divide it by 2, since you can make it into a half.