which ordered triple is the solution to the system below?
-4r + s + 3t =-26
31-55+t=-2
-+s=-2
a) (-6, 1,4) b) (0, 1,3)c(4, 2,-4) d)(1,0,3)

The weekly amount spent by a company for travel has an approximately normal distribution with mean = $550 and standard deviation = $40. a) what is the probability that the actual weekly expense will exceed $570 for more than 20 weeks during the next year? (note: one year = 52 weeks) b) what is the probability that actual weekly expenses exceed $580 for 10 or more, but 16 or fewer weeks during the next year?