The amount troy charges to mow a lawn is proportional to the time it takes him to mow the lawn. troy charges $30 to mow a lawn that took him 1.5 hours to mow. which equation models the amount in dollars, d, troy charges when it takes him h hours to mow a lawn? a. d = 20h b. h = 20d c. d = 45h d. h = 45d

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)?