25 is 40% of what number

What is the product of the radical expression. (7-2square root) (8+2 square root)

Easy points boii. read it. ya. fresh

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.