CAN ANYBODY PLEASE HELP I NEED HELP ASAP ILLL GIVE BRAINLIEST

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

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.

X+y=-4 x-y=2 use elimination with adding and subtraction