She has extra because she only wants to make 80oz and it takes 8 and she has 30 so 30 is extra
        
             
        
        
        
I'm just going to give you a very quick answer, but I can answer the question
1 foot = 12 inches.
x feet = 60 inches.
1 foot * 60 inches = 12 * x divide by 12
60 / 12 = 5 
So the person is at least 5 feet tall. The height you want is 5 feet 4 inches.
So add 4 inches to 5 feet.
or
Add 4 inches to 60 inches.
you get 64 inches.
There are 20 entries all together. 2 people are 64 inches tall. 
P(64) = 2/20 = 1/10 = 0.1
Answer P(64) = 0.1
I would check all of this if I were you. I'm not sure I counted either one correctly. 
        
             
        
        
        
Answer: 8
Step-by-step explanation:
4 is the base. 8 are the sides
 
        
             
        
        
        
Answer:
Step-by-step explanation:
-3.9364916731
 
        
             
        
        
        
All are easy. There is no way to say thatnone way is easier than the other. Well the answer lies in every individual, it depends on which method they are comfortable with. Anyway there are more method to solve quadratic than the listed ones.