Help me please its simple loool

which one is it

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 could explain what happened when the time was equal to 120 minutes

Three times the sum of a number and seven is negative thirty-six. what is the number?