Hi there
Let's order the transactions
on May 1. 150
less On May 20 100 books were sold 
Less June 3, 31 books were purchased by the students 
Add on June 15 25 books arrived
Add On June 17, a shipment of 150 books arrived
So
the number on hand on June 17
150−100−31+25+150
=194....answer
Hope it helps
        
             
        
        
        
Answer:
A. and D. 
Step-by-step explanation:
 
        
             
        
        
        
You are measuring people and animals, so this is for sure two of your units. For the next units, you need to choose something big enough to hold a large number of these, so you would use square meters and acres. The answer is the third option: <span>number of people per square meter and number of animals per acre</span>
        
                    
             
        
        
        
Answer:
B.28, 4 + (6*4) = 24 + 4 = 28 
 
        
                    
             
        
        
        
M = -4 -4 / 5- 3 = -8/2 = -4
y = -4x + b
4 = -12 + b
b = 16
y = -4x + 16