If f(x)=4+5, which of these is the inverse of f(x)?

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.

Find the value of x. round the length to the nearest tenth

If f(x)=x+7 and g(x)=1/x what is (fog)(x)