5: general note: it's better to use [] for a list instead of () - in this case it still works but in others it won't
5c - just print out the total sum.
5d - just print out the total product

8 - I get the following error:

Traceback (most recent call last):
  File "/Users/davidaronson/Documents/GitHub/owen/Owen-Chapter-2-4/3ex8.py", line 7, in <module>
    print("heading=",sum(160, -43, 270, -97, -43, 200, -940, 17, -86))
TypeError: sum expected at most 2 arguments, got 9

try using alex.heading() after the loop