Help me pls and thank you

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

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?