Can someone me? i need this finished asap, so if anyone can me, that would be great!

there are approximately 400 million trees currently growing in the amazon rainforest, which covers approximately 5.5 million square kilometers. the rainforest is being cleared at a rate of 20,000 square kilometers per year to make way for new farmland and to harvest wood for building supplies. before this year, 250,000 square kilometers had already been cleared. a preservation consortium is trying to mitigate the loss of rainforest by planting new trees. they have already planted 3,000 square kilometers of trees and plan to plant 100 square kilometers of trees each year.

now that you have the context, i need to create an equation for this? i'm not sure as to how i would do that