How do u solve xk = w - v for x

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

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

What expression is equivalent to log3(x+4)