## In each function, copy the function header to your own file. 
## Your solution will replace "pass" in the body of the functions. 
## Question 1 is started for you in the supplied a05q1.py.

# Question 1 - Part a
def dot_product(A, B):
  pass

# Question 1 - Part b
def keep_positive(L):
  pass

# Question 2
def count_digits(n):
  pass

# Question 3
def collatz_number(n):
  pass

# Question 4
def is_folded(old, new):
  pass
