Answer:
1674
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
3 units up
Step-by-step explanation:
when the y intercept goes u, so does the line
 
        
             
        
        
        
Answer:
It will take 100 songs for the monthly price of Napster to cost the same as iTunes.
Step-by-step explanation:
Let's create two equations to represent iTunes (T(d)) and Napster (N(d)):
T(d)=0.99d
N(d)=0.89d+10
In order for us to find when the two prices will be the same, let's set the equations equal to each other and solve for x:
0.99d=0.89d+10 
0.1d=10
d=100
 
        
                    
             
        
        
        
Ok. So she wants to advertise that there are 100 different dolls available. If she adds another category, then at most she already had 99 different types. If I'm right (don't take my word for it) but the minimum she would have to have is one.  <span />