The answer to your question, would be 7x + 10.
Hopefully this helps!
        
             
        
        
        
Answer: a = 3.5
Step-by-step explanation:
14=4a
divide both sides by 4
14/4 = 3.5
4a/4 =1a or a
so a= 3.5
 
        
                    
             
        
        
        
Y1 is 3x, y2 is x^3 and y3 is 3^x
 
        
             
        
        
        
Peggy has 12 practice sessions
The first step is finding the unit rate. We can do this by evaluating 
21/1.75 divided by 1.75/1.75.
When you divide the two, you get 12.
To check your work you do 12(1.75) and you will get 21