What is the common difference in the arithmetic sequence 30, 27, 24, 21, 18, a. -1 c. 3 b. -3 d. 30

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

Find the domain and range of the following function f(x) = 51x - 21+ 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)?