Algerbra 2 homework help: Exponentials and Logarithms?

I was sick and out of school the day of the lesson. Any help would be greatly appreciated! Also, if you can explain to me how you got the answers, so I can learn how to do it, that would be even better!

In 2004 Mr. Martin bought a Honda Civic for $19,200. In 2015 the car was valued at $4,300. Assuming normal wear and tear, calculate the following, showing all work:

a. The rate of depreciation.

b. The value of the car in 2017.

(HINT: This is exponential, not linear!)

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