**Exponential Growth and Decay -- Quiz**

(a) How much iodine, in micrograms, is going to be left after 3 days?

**(A) **
20.51
**(B) **
64.19
**(C) **
38.56
**(D) **
27.98

(b) Find the half-life of the iodine, in days.

**(A) **
11.5
**(B) **
6.25
**(C) **
8.00
**(D) **
12.3

How many years will it take for your money to double?

**(A) **
13.86
**(B) **
1.38
**(C) **
25.89
**(D) **
40.00