Please help ASAP due soon I need help

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.

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?