After long study, tree scientists conclude that a eucalyptus tree will grow at the rate of 0.6

Question:

After long study, tree scientists conclude that a eucalyptus tree will grow at the rate of 0.6 + 4/(t + 1)³ ft per year, where t is time (in years).
(a) Find the number of feet that the tree will grow in the second year.
(b) Find the number of feet the tree will grow in the third year.

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