Answer:
When f or g are equivalent to a number you are solving for x. For example b, d, e, f. In the equation g(x) =2x2-5 I assumed 2 was a typo. So, if it's incorrect, please use same steps and just adjust the solution.
Step-by-step explanation:

a)  
 
             
  
 
b) 
        
 
       
   
         
 
 c) 
                
                
d) 
       
       
         
e) 
         
        
         
f)  
          
         
          
 
        
             
        
        
        
Answer:
Approximately 920.324 p/m
Step-by-step explanation:
so to figure this out, we need to simply divide 6,688 people by 7.267 square miles. 6,688/7.267=920.324.... So we have approximately 920.324 people per square mile
 
        
             
        
        
        
I don’t understand apply to what?
        
             
        
        
        
Answer: 800
Divide 3200 by 4 to get 800.
        
                    
             
        
        
        
d) x=-12 because x/-3=4 can be rearranged as x=4x-3 so x=-12