Distribute and combine like terms: 5(x + 3) + 3x

Answer this question only if you know the answer! 30 points and

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.

Having a hard time understanding this question (see attachment).