I'm not sure that this is what you wanted, but the solution is x = 2500

Note: when we have no number as the logarithmic base, it is 10 by default.
You put a value in for r, and keep trying until they equal out, let me know if this helps, or if you need more
They're easier to get than both mortgages and car loans
Answer:
Option B. 4<=x<=6 is the solution set.