00:01
Okay, so given this event, my first question is this exponential growth or decay? well, since i have the phrase decreases by a certain percent, this would be exponential decay.
00:13
So how do i write a certain exponential decay formula? well, it's always y equals my a value, which is my starting value, times one minus whatever my rate is, percent rate is.
00:25
And since i'm repeatedly multiplying by this percent rate, repeat a multiplication.
00:30
Leads to an x below it.
00:32
Okay, so what is my starting amount? well, a population of 9 ,000, so my starting amount is 9 ,000, decreases by 2 .5 % per year.
00:45
So whenever i have a rate, always write it as a decimal, divide by 100 and move a two place to the left, 0 .025...