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Find two rational expressions that have the difference of 2-n/n-4

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

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.