There are currently 24 frogs in a (large) pond. the frog population grows exponentially, tripling every 6 days.

how long will it take (in days) for there to be 120 frogs in the pond?

the pond's ecosystem can support 1700 frogs. how long until the situation becomes critical?

time to 1700 frogs:

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)?