Answer:
Step-by-step explanation:
Devon's sister is incorrect. 
Note 6 drinks thats cost $2.99
2.99 divided by 6 is $0.50 
Thus each drink is approx. $0.50 
She would find it if she divided total number of drinks by the total price
 
        
             
        
        
        
Answer:
Step-by-step explanation:
I think you are just asking for the decimal answers.
3/20 = 0.15
9/50 = 0.18
38/200 = 0.19
 
        
             
        
        
        
Y - y1 = m(x - x1)
slope(m) = 3/4
(-4,6)....x1 = -4 and y1 = 6
now just sub...and pay attention to ur signs
y - 6 = 3/4(x - (-4)...not done yet
y - 6 = 3/4(x + 4) <===