When you multiply a number by 1/4 is the product 1/4 of the original number?

How do you do this geometry problem

Which shows the image of rectangle abcd after the rotation (x, y) → (–y, x)?

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.