Problem of the Week Elementary

Question: Grace plants a pea for her science fair project and measures how much it grows each week. The first week, it grows 2 inches. After 2 weeks, it is 5 inches tall. After 3 weeks, it is 9 inches tall. After 4 weeks, it is 14 inches tall. After 5 weeks, it is 20 inches tall. If the pattern continues, how tall will the pea plant be after 6 weeks?