A football team is on the 40-yard line after four plays. On the first play they gained 15 yards. On the second play they lost 6 yards. They gained 3 yards on the third play and twice as many on the fourth play. On which yard line did the team begin?

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?