Question

A company had 17,000 copies of a book to sell in 2012. In 2013, it had 14,000 copies to sell. In 2014, it had 11,000 copies to sell. How many copies do you think the company had to sell in 2015? Explain.​

Answer 1

Let’s pretend we are making a table
For 2012, 17,000 copies
For 2013, 14,000 copies
For 2014, 11,000 copies
It seems to decrease at a constant rate
17,000-3000 = 14,000
14,000 - 3000 = 11,000
11,000 - 3000 = 9000

Solution: 9,000 copies