Mr. keller bought a car for $20,000. a study shows that a car will depreciate (go down in value) by 15% each year. how much is mr. keller’s car worth after 5 years? a) formula used: b)substitute values: c) final answer d) does this final answer make sense compared to the original cost of the car? why? e) describe (using a complete sentence or two) how you can solve this problem graphically. answer all