Answer:
a. ⅓ × 4
b. ⅖ × 3
c. ⅙ × 3
Step-by-step explanation:
i think
 
        
             
        
        
        
5/8 that's how ratio of students that will buy lunch. so in order to find number students who will buy the lunch out of 720, just multiply 720 with 5/8 ie, 720x5/8 ie 450.
450 is answer
 
        
             
        
        
        
56 is the right answer trust me
 
        
                    
             
        
        
        
Answer:
-2, -1/2
Step-by-step explanation:
 
        
                    
             
        
        
        
<h3>
Answer: True</h3>
This is often how many math teachers and textbooks approach problems like this. The overlapped region is the region in which satisfies every inequality in the system. Be sure to note the boundary of each region whether you're dealing with a dashed line or a solid line. Dashed lines mean points on the boundary do not count as solution points, whereas solid boundaries allow those points as part of the solution set. 
Side note: This is assuming you're dealing with 2 variable inequalities. If you only have one variable, you don't need to graph and instead could use algebra. Graphing doesn't hurt though.