Help 6x+6y=-6
x=-5y-13

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

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?