the percent of 21th graders in a certain state who have ever used cigarettes for each of the year 2000 through 2014 can be modeled by p= -1.708t + 60.341, where p is equal to the percent and t is equal to number of the year after 2000 . when will the percent be less then 23%?
+37170 The percentage is decreasing yearly (yea!).....
so
23 = -1.708t + 60.341 and solve for 't'
23-60.341 = - 1.708t
-37.341=-1.708t t=21.86
So at 2021.86 it equals 23%
in 2022 it will be less than 23 %
