Urgent please help..

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 value of x is in the solution set of 4x - 12 s 16 + 8x? -10 -9 -8 -7

What is the frequency of the sinusoidal graph?