Are you sure this is Geometric?
7, 20 (7+13), 33 (20+13), x (33+13), and so on.
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A student plants a seed. After the seed sprouts, the student monitors the growth of the plant by measuring its height every week. The height after each of the first three weeks was 7mm,20mm,33mm, respectively. If this pattern of growth continues, in what week will the plant be more than 100mm tall?