Tish and Emma are knitting scarves. Tish's scarf is 17.76 inches long, and she knits 2 3/8 inches per minute. Emma's scarf is 4 inches long, and she knits 3 3/4 inches per minute. After how many minutes will Emma's scarf be longer than Tish's scarf?

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?