Hey!
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![\large\boxed{The~plant~grew~2(1)/(2)~feet!}](https://img.qammunity.org/2020/formulas/mathematics/middle-school/xlqalwbycx133wknt3o1wpubbtwewp8smk.png)
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Steps To Solve:
~Find common denominators
6/7 = 54/63
2/9 = 14/63
~Turn into improper fractions
1 54/63 = 117/63
4 14/63 = 266/63
~Subtract.
266/63 - 117/63 = 149/63
~Turn into mixed number
149/63 = 2 23/63
~Round
2 23/63 ≈ 2 1/2