Z= a - m - b, solve for a. i'm not really sure on how to solve this. could someone me step by step?

What are the domain and range of f(x)=[1/5]x

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 is the graph of f(x) = (4)x? image for option 1 image for option 2 image for option 3 image for option 4