Acompany's annual production of ethanol, used a fuel for automobiles, was 33 million gallons in 2001 and has dwcreases by about 27% per year since then. predict the year when annual ethanol production will be 5.6 million gallons.

3 years
Because you can first try to find the percent of change from 33 to 5.6 so 33-5.6=27.4/33= .83 which equals 83% then take 33 and multiply it by .83 and it will give you 27.39 then take 33 and subtract 27.39 and you get 5.6. To know that it equals 3 years take .83/.27 and it gives you 3, which equals the amount of years.