Answer: the answer is 4.19 I found this by dividing 50.28 by 12.   I don't know if this is called the unit
 
        
             
        
        
        
Rewrite the expression as

Factor 2a from the first two terms and 3b from the last two:

Factor a-2b

 
        
             
        
        
        
The height of stack is 36 feet.
<h3>What is unitary method?</h3>
The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value
Given:
height of 1 crate = 3 feet
height of 1 crate in inch = 3*12
= 36 feet
Hence, the height of stack of shipping crates is 36 feet.
Learn more about unitary method here:
brainly.com/question/11214202
#SPJ1
 
        
             
        
        
        
It would be 31.80 because if you do 1.59 x 20 that will be the answer