Do you know that an increasing demand for paper contributes to the destruction of trees from which papers are made? If waste papers were recycled regularly, it would help prevent the cutting down of trees, global warming and other adverse effects that would destroy the environment. Paper recycling does not only save the earth but also contributes to the economy of the country and to the increase in income of some individuals. This is one situation where questions such as “ Will a decrease in production of paper con- tribute to the decrease in the number of trees being cut?” can be answered using the concepts of variations . There are several relationships of quantities that you will encounter in this situation. You will learn how a change in one quantity could correspond to a predictable change in the other. Activity Please write your answer in the comment box. Let’s Recycle! The Supreme Student Governance launches a recycling campaign of...