The equation which is used to determine the approximate current value of the car by the depreciation equation is,

<h3>What is depreciation?</h3>
Depreciation is to decrease in the value of a product in a period of time. This can be given as,

Here,(y) is the current value, (A) is the original cost of the product, (r) is the rate of depreciation and (t) is the number of years.
Now the car was purchased 6 years ago. The original cost of the car is $25,000 and the annual depreciation rate is 11%.
The rate can be given as,

Thus, to find the equation can be used to determine the approximate current value of the car, put the values in the above formula as,

Hence, the equation which is used to determine the approximate current value of the car by the depreciation equation is,

Learn more about the depreciation here;
brainly.com/question/25297296