10 points please help pic of the problem is inserted

Which three lengths could be the lengths of the sides of a triangle? 21 cm, 7 cm, 7 cm 9 cm, 15 cm, 22 cm 13 cm, 5 cm, 18 cm 8 cm, 23 cm, 11 cm

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.

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