20 in I’m for sure on this answer
        
             
        
        
        
Answer:
Yes
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
The number of elephant ears that must be sold to maximize profit is 400.
Step-by-step explanation:
Given that,
The profit that a vendor makes per day is given by 
P(x)= - 0.004x² +3.2 x -200
where x is number of elephant ears.
P(x)= - 0.004x² +3.2 x -200
Differentiating with respect to x
P'(x)= - 0.008x+3.2
Again differentiating with respect to x
P''(x) = -0.008
For maximum or minimum P'(x)=0
- 0.008x+3.2=0
⇒0.008x=3.2

⇒ x = 400

Since at x=400, P''(x)<0, the profit is maximize.
P(400) = -0.004×400²+3.2×400-200
           =440
The number of elephant ears that must be sold to maximize profit is 400.
 
        
             
        
        
        
Answer:
you bet
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
3 minutes 
Step-by-step explanation:
To find how many minutes it will take to play the whole song, multiply 1/5 by 15
15(1/5)
= 3
So, it will take 3 minutes to play the whole song