Negation of no planes have three wheels

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.

What is the value of x in the following equation? -3x-2=2x+8

Which of the choices shown could be used to prove that aacp=abcp ?