Solve the problem. The value, V, of a Honda Civic DX Sedan that is x years old is given by
V(x)=18,630(0.90)^x
a) What is the value of a 4-year-old civic DX Sedan?
b) How many years does it take for the value of a civic DX Sedan to drop to just below $10,000? (Round to nearest tenth of a year.)