The value in Canadian dollars of the money in Merl's bank account goes down because it takes .14 more Yuan to make 1 Canadian dollar.
        
             
        
        
        
Ok... so this question can be solved by using simultaneous equations. 
Use the general from of a parabola 

you know the value of c, the y-intercept... y = -4
which means the equation is 

now use the other 2 points to get 2 equations in 2 unknowns
(-2, -20) just substitute 

this becomes

now the other equation using (4, -20)
The simplified form is 
 
        
        
        
Answer:
Rad 68
Step-by-step explanation:
84- 4^2=68
 
        
                    
             
        
        
        
Answer:
subtracting 5 from both sides
Step-by-step explanation:
please mark brainliest lol :)