An online music store sells about 4000 songs each day when it charges $1 per song. for each $0.05 increase in price, about 80 fewer songs per day are sold. use the verbal model and quadratic function to determine how much the store should charge per song to maximize daily revenue. r(x)=(1+0.05x)(4000-80x)

The best price is $1.75.

Step-by-step explanation:

Profit = Songs x Price  

Given equation is ;

Solving this :

Let the number of $0.05 increases be x.

R(x) =

The revenue is maximized when dR/dx = 0.  

dR/dx =

The revenue is maximized when x = 15

Means when the price per song = $1.00 + ($0.05*15) = $1.75

Therefore, the best price is $1.75.

d 192

step-by-step explanation:

we find our area to find area we multiply thoses numbers to get our answer so our area is 192

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.