Question

A teacher donates the same amount of money each year to help protect the rainforest. At the end of the second year, she has donated enough money to protect 8 acres. At the end of the third year, she has donated enough money to protect 12 acres. How many acres will the teacher's donations protect at the end of the tenth year?​

Answer 1

The teacher's donations protect an additional 4 acres (12 acres - 8 acres) between the second and third years. Since she donates the same amount each year, she will protect 4 more acres in each subsequent year.

So, for each year after the third year, she protects an additional 4 acres. Therefore, at the end of the tenth year, she will have donated enough money to protect:

12 acres (third year) + 4 acres/year * 7 years (from year 4 to year 10) = 12 acres + 28 acres = 40 acres.

At the end of the tenth year, her donations will protect 40 acres.