Let's take a look at D:   
<span>D)    y = (x-1)^2 - 16     Compare this to 
        y = (x-h)^2 + k       This is the std. equation of a parabola in vertex form.
You can see, by comparison, that h=1 and k= -16; these are the coordinates of the vertex, clearly shown in the diagram.
Since the coefficient of (x-h)^2 is +1, the graph opens upward (which the given graph confirms), and is neither compressed nor stretched vertically.</span>
        
             
        
        
        
Move the decimal places, the answer is 6.7 x 10^6
        
             
        
        
        
Answer: he will make $2784 in 60 days