Greenhouse gases such as carbon dioxide trap heat from the sun. Presently, the net incoming solar radiation reaching Earth's surface is approximately 240 watts per square meter (W/m²). Any portion of this amount that is due to greenhouse gases is called radiative forcing. The table lists the estimated increase in radiative forcing R above the levels in 1750.

(a) Estimate constants Cand k so that R(x) = Ce^kx models the data. Let x = 0 correspond to 1800. 

(b) Estimate the year when the additional radiative forcing could reach 3 W/m².

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x (year) 1800 1850 1900 1950 2000 0.2 0.4 0.6 1.2 2.4 R(x) (w/m²)