Between 1851 & 2005​, carbon dioxide ​(CO2​) concentration in the atmosphere rose from roughly 250 partsper million to 378 partsper million.?

Update: Assume that this growth can be modeled with an exponential function Q=Q0 x (1 + r)t a. By experimenting with various values of the growth rate​ r, find an exponential function that fits the data for 1851 and 2005. r ≈___ (Round to five decimal places as​ needed.) b. Use this exponential model to predict when the... show more Assume that this growth can be modeled with an exponential function Q=Q0 x (1 + r)t

a. By experimenting with various values of the growth rate​ r, find an exponential function that fits the data for 1851 and 2005.
r ≈___
(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.)
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