### How many years will it take for this country to have 91 million cars?

Please explain in detail the steps to solving these problems. #6/#7/#20/#27 6. Graph exponential function f(x) = 3^(x - 4) 7. graph f(x) = 2^(x +1) 20. There are currently 73 million cars in a certain country, increasing by 1.7% annually. How many years will it take for this country to have 91 million cars? Round to the n