HELP PLEASE!!❤️ I don’t understand at all :(

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.

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

98 point question what is the record for most points in one