\fFind the indefinite integral. ( 20 + 76 da = +CFind the indefinite integral. -J d.t = +C( * + 2 dac = +COver the past fty years the carbon dioxide level in the atmosphere has increased. Carbon dioxide is believed to drive temperature, so predictions of future carbon dioxide levels are important. If C (t) is carbon dioxide level in parts per million (ppm) and t is time in years since 1950, three possible models arel: I. C\"(t) = 1.3 11. 0"(t) = 0.5 + 0.03: III. 01:) = ass-0% (a) Given that the carbon dioxide level was 316 ppm in 1950, nd C(t) for each model. we: we: we: (b) Find the carbon dioxide level in 2020 predicted by each model. Model I predicts Wl:l Model II predicts C |:|ppm |:|PPm Model III predicts C