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What is the value of y? round 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.

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?