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

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n