7. The graph shows the amount of a medicine m, in milligrams, remaining in a patient's body h hours after receiving an injection. The amount of the
medicine decreases exponentially.
A(0,270)
250
200
(poq unup Jo Sw)
150
100
(1.5, 80)
SO
0.5
2.5
h (hours since injection)
a. By what factor did the medicine decrease in the first hour and a
half? Explain how you know.
b. By what factor did the medicine decrease in the first half hour?
What about in the first hour? Explain how you know.