Kelly bought a new car for $20,000. the car depreciates at a rate of 10% per year. write an equation to model the car's value.

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 , where

a = Initial value,

r = Decay rate in decimal form.

Let us convert 10% into decimal form as:

Upon substituting our given values in decay formula, we will get:

Therefore, our required equation would be .

answer: the answer is d