Anja is substituting t=5 and t=9 to determine if the two expressions are equivalent. 4(2t-5) 10t-38 which statement is true?
a) both expressions are equivalent when t=5 but the two expressions are not equivalent.
b) both expressions are equivalent when t=5 and the two expressions are equivalent.
c) both expressions are equivalent when t=9, but the two expressions are not equivalent.
d) both expressions are equivalent when t=9, and the two expressions are equivalent.

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)?