2616.95 rounded to the nearest tenth

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.

Which choice represents the sample space ,s for this event

What is the y intercept of f(x)=(1/2)^x?