The table below shows the average diameter of a pupil in a person’s
eye as he or she grows older.
age average pupil
(years) diameter (mm)
20 4.7
30 4.3
40 3.9
50 3.5
60 3.1
70 2.7
80 2.3
what is the average rate of change, in millimeters per year, of a
person’s pupil diameter from age 20 to age 80?
(1) 2.4 (3) -2.4
(2) 0.04 (4) -0.04

Situation: . find the substance's half-life, in days. round your answer to the nearest tenth. a 11 gram sample of a substance that's used to treat thyroid disorders has a k. value of 0.1247. enter the correct answer n - noekt done no - initial mass (at time t = 0) n - mass at timet k a positive constant that depends on the substance itself and on the units used to measure time t= time, in days