Between 1851 & 2005, carbon dioxide (CO2) concentration in the atmosphere rose from roughly 250 partsper million to 378 partsper million.?
a. By experimenting with various values of the growth rate r, find an exponential function that fits the data for 1851 and 2005.
(Round to five decimal places as needed.)
b. Use this exponential model to predict when the CO2
concentration will double its 1851 level. According to this model, the CO2 concentration will double its 1851
level in _____
.(Type a whole number.)