Suppose we have two machines and one repairman. A machine’s life time is exponentially distributed with rateλ. When a machine breaks, the repairman works on it and the repair time is exponentially distributed with rateμ. All times are independent. Let X(t)denote the number of machines working. Is X(t)a continuous-time Markov chain? Why?
Find the long-run probability that both machines are down

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.