Barbara buys a box of pens for $4. for every additional box she buys, she gets a $1 discount. which expression represents the total cost of the pens, c, as a function of the number of boxes, b?

a. c=f(b)=4b-1
b. c=f(b)=4b+1
c. c=f(b)=3b+4
d. c=f(b)=4b+3
e. c=f(b)=4+3(b-1)

E.

Step-by-step explanation:

Let b represent the number of boxes.

We have been given that Barbara buys a box of pens for $4, so the cost of 1st box will be $4.

Now the number of boxes without 1st box will be .

We are also told that for every additional box she buys, she gets a $1 discount, so the cost of b boxes without 1st box will be .

The total cost of all the boxes will be cost of 1st box plus cost of b boxes.

Since we need to represent the total cost of the pens, c, as a function of the number of boxes (b), so our function will be:

Therefore, our required function is and option E is the correct choice.

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