At the Mauna Loa Observatory, measurements of CO2 levels (ppm) in the atmosphere reveal a slow exponential increase due to deforestation and burning of fossil fuels, and a periodic seasonal variation.
In 1960, the average CO2 level was 320.50 parts per million and was rising by 0.5% per year. Write the average annual CO2 level as an exponential function of time, t, in years since 1960.

Question

At the Mauna Loa Observatory, measurements of CO2 levels (ppm) in the atmosphere reveal a slow exponential increase due to deforestation and burning of fossil fuels, and a periodic seasonal variation.
In 1960, the average CO2 level was 320.50 parts per million and was rising by 0.5% per year. Write the average annual CO2 level as an exponential function of time, t, in years since 1960.