How to calculate the reference angle for 0=11 pi over 6

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.

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

If 3x+8=3x+8 is it one solution or no solution