Simplify:

3-2
what is this awnser

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.

Ineed me i stuck and i don’t want to get it wrong

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with