Ill recomment on my thing right now with the answer let me just go read up on how to do this
The answer is line segment. :)
Your choice of answer D is correct.
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When the number of days is zero, the height is 130 inches. This eliminates choices B and C. Evaluating the expression for n=13 gives
... 130 + 13×13 = 130 + 169 = 299 . . . . . corresponding to answer D.