Bertrand collects movie posters. The number of movie posters in his collection changes each month as he buys and sells posters. The table show how many posters he brought or sold in the given months.

Question

January sold 20, February bought 12, March bought 22, April sold 28.

1. Which months have changes that can be represented by positive numbers? Which months have changes that can be represented by negative numbers?

2. Which month did the size of Bertrand's poster collection change the most? Use absolute value to explain your answer. My answer is the month of March which is -10.

Answer 1

1. feb, mar +
jan,apr -

3. March it ichanged by 22, apr changed by 28

Answer 2

Feb,Mar+
Jan,apr-