To write a function f describing the average cost of sealable books. Given information: The printing and binding cost for a college algebra book is $10. The editorial cost is $200,000. The first 2500 books are free.

Calculation:
Let the number of books be x. Since the printing and blinding cost for a college algebra cost is $10. The printing and blinding cost for 10 algebra books is 10x. The editorial cost is $200,000. The first 2500 books are free.
Thus, the average cost of sealable books is
${\displaystyle f\left(x\right)=\frac{\to tal\cos t}{\nu mberofsealab\le b\mathrm{\infty }ks}}$
${\displaystyle f\left(x\right)=\frac{10x+200,00}{x-2500}}$
Hence, the required function is ${\displaystyle f\left(x\right)=\frac{10x+200,00}{x-2500}}$.