Choose all that give the correct expression. a) steven lost four $10 bills, and now he has −$40. −4 × 10 b) if i lose 8 pounds per month for 3 months, my weight will change −24 pounds total. 3 × (−8) c) sarah spends $2 for each fare on the commuter train. she rides the train 10 times during a week. 2 × (−10) d) pat and amy were on a diet for 4 months. pat lost an average of 3 pounds a month, and amy lost an average of 4 pounds a month. 4((−3) + (−4))

There are two major tests of readiness for college: the act and the sat. act scores are reported on a scale from 1 to 36. the distribution of act scores in recent years has been roughly normal with mean µ = 20.9 and standard deviation s = 4.8. sat scores are reported on a scale from 400 to 1600. sat scores have been roughly normal with mean µ = 1026 and standard deviation s = 209. reports on a student's act or sat usually give the percentile as well as the actual score. the percentile is just the cumulative proportion stated as a percent: the percent of all scores that were lower than this one. tanya scores 1260 on the sat. what is her percentile (± 1)?