Preserve the Pachyderms

Welcome to my AP for the third unit of Population. For this AP, I made a video about how human population growth is affecting the chosen organism's population growth. The organism I chose to research was the elephant. The reason why I chose to research elephants is because of their unique behaviors and how their population is quickly decreasing because of humans. You will learn more about what is happening to them in the video below. My math equations appear after the video. They reflect how I got the data for the elephant population on my graph in the video. It is called a geometric sequence - a type of sequence using multiplication and division. Before we get things started, I just want to say that the things we learned in this unit are arithmetic and geometric sequences and symbiotic relationships, which are discussed below. This will be the final AP for my first STEAM class of my sophomore year. I hope you enjoy!

Preserve The Pachyderms from S N on Vimeo.

This is the geometric sequence math equation I mentioned earlier. Every year from 2000 to 2018, the elephant population decreased by 0.785%. That brought it down from 3,000,000 to 700,000.

Gn = 3,000,000 (0.785)^n - 1

How this works is you take the first term, 3,000,000, and multiply it by the common ratio, 0.785. Next, you take the term you are on - if you were on the second term it would look like G2, and subtract it by 1. After that, you multiply the common ratio by itself with whatever number is left over and then multiply the first term by the new common ratio. This is a geometric sequence because every time it decreases, it decreases by a different number. Arithmetic sequences increase or decrease by the same number every time. That is how I calculated the decreasing population of the elephant. I hope I gave you something to think about regarding these beautiful, endangered beasts.  

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