Your question is  store uses the expression –2p + 50 to model the number of backpacks it sells per day, where the price, p, can be anywhere from $9 to $15. Which price gives the store the maximum amount of revenue, and what is the maximum revenue?
The answer is C. $12.50 per backpack gives the maximum revenue; the maximum revenue is $312.50.
 
        
                    
             
        
        
        
The line goes 3 right for every 1 down, so the gradient is -1/3
The y-intercept is +4, so the equation is actually y=-1/3x+4, so Chris is wrong.
        
                    
             
        
        
        
2/7 x 1/3 Will Be Less Than 1/3
        
             
        
        
        
Answer: The answer would be -75 feet
Step-by-step explanation: Since it starts with a negative 15 and you are diving down then you would just multiply -15*5