Suppose that a library contains 10,000 books now, and adds 250 books every month.

(a) Write an explicit formula for a linear model that describes this growth.

P
t
=


(b) If this trend continues, how many books will the library contain in a year?

books

(c) How long will it be before the library contains 20,000 books? Round your answer to the nearest month.

months



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