**Homework 4, assigned: MON NOV 5. Part A, due MON NOV 12 11:59 pm.
**

This assignment consists of two parts, both of which should be
submitted to the grader. Please submit as a python program.

Use **from math import *** so that you can
use **log** without having **math.** before it.
### Part A

Page 145, problem 36. The half-life, T, of radioactive carbon is 5730 years.
After how many years does 20% of the original charcoal found at a campsite
remain?

### Part B

Page 163, problem 5. Remember that the value of e can be obtained either
from the Greenleaf text as 2.71828 or more acurately from math.e in python
where you have already imported the math module.