Between 1864 and 1996, carbon dioxide (CO2) concentration in the atmosphere rose from roughly 276 parts per million to 374 parts per million. Assume that this growth can be modeled with an exponential function Q=Q0×(1+r)t. Complete parts (a) and (b) below.
a. By experimenting with various values of the growth rate r, find an exponential function that fits the data for 1864 and 1996.
r≈
(Round to five decimal places as needed.)
b. Use this exponential model to predict when the CO2 concentration will double its 1864 level.
According to this model, the CO2 concentration will double its 1864 level in
(Type a whole number.)