SOLUTION: A store is having a sale on books. If you buy the first book for $12, each additional book will cost $6. Which formula models this situation?

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Question 1150943: A store is having a sale on books. If you buy the first book for $12, each additional book will cost $6. Which formula models this situation?



Found 2 solutions by ankor@dixie-net.com, ikleyn:
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
A store is having a sale on books.
If you buy the first book for $12, each additional book will cost $6.
Which formula models this situation?
:
f(b) = 6(b-1) + 12
where
b = total number of books
f(b) = total cost of the books

Answer by ikleyn(52832) About Me  (Show Source):
You can put this solution on YOUR website!
.

This function is defined for all integer values of b >= 0.


The formula is in three lines:
       
 
          0 dollars,  if b = 0,

f(b) =   12 dollars,  if b = 1

         12 + 6*(b-1) dollars,  if b > 1.