M+n=100, m-n=30 what is m and what is n

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.

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180