Question

Please Assist Creating Exponential Functions See Attachment

Answer 1

The graph shows a substance with a fixed half life of 15 minutes.
Time Amount
0 80
15 40
30 20
45 10
60 5

Amount remaining = 80 / 2^(time / half-life)

Amount remaining = 80 / 2^(0 / 15) = 80 / 2^0 = 80
Amount remaining = 80 / 2^(15 / 15) = 80 / 2^1 = 40
Amount remaining = 80 / 2^(30/15) = 80 / 2^2 = 20