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Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

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

We just started the introduction into circles and i have no idea how to do this.