Suppose the growth of a tumor with radius r(t) (t = time in weeks) is described by the equation r′(t)=k1t+n(t) where n(t)=2k2, k1=1, and k2=1.5. If the tumor's initial radius is r(0)=0.25 cm, which of the following is the closest to the time it would take for the tumor to reach a radius of 15 cm?

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