What is the value of x in the triangle?

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

Aparallel system functions whenever at least one of its components works. consider a parallel system of n components, and suppose each component works independently with probability 0.5. find the conditional probability that component n works given that the system is working

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.