Mathematics, 19.10.2019 09:30, nayelidlc2

Bertrand collects movie posters. the number of movie poster in his collection each month as he buys and sells posters. the table shows how many poster he bought or sold in the given month.

january february march april

sold 20 bought 12 brought 22 sold 28

a) which month have changes that can be represented by positive number? which month have changes that can be represented by negative number?

for 'ω'

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Bertrand collects movie posters. the number of movie poster in his collection each month as he buys...