The value of a in the equation x2+23+3x=0

Twelve friends shared 8 small pizzas equally.how many pizzas did each person get?

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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.