6.) SAT Practice: Find the solution (x, y) to the system of equations below, what is the value of x - y?
7x + 3y = 8

y = 2x - 5/3

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?