CALCULUS
posted by Anonymous .
9. Suppose an experimental population of amoeba increases according to the law of exponential growth. There were 100 amoeba after the second day of the experiment and 300 amoeba after the fourth day. Approximately how many amoeba were in the original sample?
A. 5
B. 33
C. 71
D. 10
E. Not enough information to determine

Since the population tripled in 2 days, the population after t days is
p = (100/3)*3^(t/2)