Respuesta :
Answer:
[tex]y=\$20,000\cdot (0.90)^x[/tex]
Step-by-step explanation:
We have been given that Kelly bought a new car for $20,000. The car depreciates at a rate of 10% per year. We are asked to write an equation to model the car's value.
Since car's value depreciates by 10% per year, so value of car is depreciating exponentially.
We know that an exponential decay function is in form [tex]y=a\cdot (1-r)^x[/tex], where
a = Initial value,
r = Decay rate in decimal form.
Let us convert 10% into decimal form as:
[tex]10\%=\frac{10}{100}=0.10[/tex]
Upon substituting our given values in decay formula, we will get:
[tex]y=\$20,000\cdot (1-0.10)^x[/tex]
[tex]y=\$20,000\cdot (0.90)^x[/tex]
Therefore, our required equation would be [tex]y=\$20,000\cdot (0.90)^x[/tex].
