The equation for the situation is ![y=200(\frac{2}{3})^{x}](https://tex.z-dn.net/?f=y%3D200%28%5Cfrac%7B2%7D%7B3%7D%29%5E%7Bx%7D)
It will take around 9 years for her to have around 5 sheep
Step-by-step explanation:
The exponential decay growth/decay equation is
, where
- a is the initial value
- b is the growth/decay factor
- If b > 1, then it is a growth factor
- If 0 < b < 1, then it is a decay factor
Erica is a sheep farmer. She is having a problem with wolves attacking the flock. She starts with an initial 200 sheep and notices that the population is two-thirds of the previous year
∵ The population is decreased
∴ The equation is decay
∵ The population is two-thirds of the previous year
∴ The decay factor is ![\frac{2}{3}](https://tex.z-dn.net/?f=%5Cfrac%7B2%7D%7B3%7D)
∵ She starts with an initial 200 sheep
∴ the initial value is 200
∵ The decay equation is
, where y represent the
population in x years
∵ a = 200
∵ b = ![\frac{2}{3}](https://tex.z-dn.net/?f=%5Cfrac%7B2%7D%7B3%7D)
∴ ![y=200(\frac{2}{3})^{x}](https://tex.z-dn.net/?f=y%3D200%28%5Cfrac%7B2%7D%7B3%7D%29%5E%7Bx%7D)
The equation for the situation is ![y=200(\frac{2}{3})^{x}](https://tex.z-dn.net/?f=y%3D200%28%5Cfrac%7B2%7D%7B3%7D%29%5E%7Bx%7D)
∵ The population after x years is around 5 sheep
- Substitute y by 5 to find x
∵ ![5=200(\frac{2}{3})^{x}](https://tex.z-dn.net/?f=5%3D200%28%5Cfrac%7B2%7D%7B3%7D%29%5E%7Bx%7D)
- Divide both sides by 200
∴ ![0.025=(\frac{2}{3})^{x}](https://tex.z-dn.net/?f=0.025%3D%28%5Cfrac%7B2%7D%7B3%7D%29%5E%7Bx%7D)
- Insert ㏒ for both sides
∴ ![log(0.025)=log(\frac{2}{3})^{x}](https://tex.z-dn.net/?f=log%280.025%29%3Dlog%28%5Cfrac%7B2%7D%7B3%7D%29%5E%7Bx%7D)
∴ ![log(0.025)=xlog(\frac{2}{3})](https://tex.z-dn.net/?f=log%280.025%29%3Dxlog%28%5Cfrac%7B2%7D%7B3%7D%29)
- Divide both sides by ![log(\frac{2}{3})](https://tex.z-dn.net/?f=log%28%5Cfrac%7B2%7D%7B3%7D%29)
∴ 9.098 = x
∴ x is around 9 years
It will take around 9 years for her to have around 5 sheep
Learn more:
You can learn more about the equation in brainly.com/question/10666510
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