When you get less than 50% on a grade

Which system of linear inequalities is represented by the graph? !

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 sum of these mixed numbers 2 1/8 + 4 3/8