1. Technetium-99m is a drug taken by a patient and then used to study tumors in the brain, lungs and other parts of the body. A patient takes a 1000-mg pill. The data below shows how much active ingredient remains in the body over 6-hour time intervals. Technetium-99m Decay
# of 6-hour time intervals Amount of Drug remaining (mg)
0 1000
1 500
2 250
3 125
a) What is the initial value?

b) What is the growth/decay factor?

c) Write a rule for the function.