I need help I’m confused about this

Evaluate: 10 + 4

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

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.

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.