Answer:
Step-by-step explanation:
hello : 
r+b=7... (*)
3.75r+2.75b=22.25.... (**)
use (*) :  r = 7 - b 
put this value in (**) : 
3.75(7 - b)+2.75b =  22.25
26.25 -375b +2.75b = 22.5 
 -375b +2.75b = 22.5 - 26.25
- b = -3.75
so : b  = 3.75
but : r = 7 - b
r = 7 - 3.75
r = 3.25
 
        
             
        
        
        
Answer:
Volume ≈ 33.33 cubic feet
Step-by-step explanation:
The question is:
<em>Find the volume of a right square pyramid with base square edges measuring 5 feet each and a height of the pyramid be 4 feet.</em>
<em />
So, the base is a square with side length 5 feet. 
And the height of the pyramid is 4 feet.
The volume of a pyramid is given by the formula:

Where
a is the square base side length (given as 5)
h is the height of the pyramid (given as 4)
Now we substitute and find the value:

The volume is around 33.33 cubic feet
 
        
             
        
        
        
I'm sorry that I'm not in calculus, but hopefully I can help. 
Personally, I would choose: D.) x; in the second equation ; 
because it has easier numbers to figure out, you'll get it eventually...
        
             
        
        
        
Absolute value means the distance from 0.
|-0.45| =0.45
|-0.0045|=0.0045
0.45>0.0045
So 
|-0.45|>|-0.0045|
 
        
                    
             
        
        
        
4 quarts is 1 gallon
6 pints is 0.75 gallons
4 cups is 0.25 gallons 
if you add all of those you would get 2 gallons
so she would need 1 more gallon of lemonade