All you have to do here is plug in the 3 for all of the t’s.  So the first part of the expression, 2t³  would equal 2*(3³), which equals 9*2, or 18.  Now plug in 3 for t in (2t)³.  Then you will get (2*3)³, which equals 6³ or 216.  Then add 216 and 18 to come up with the answer 234, C.
 

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