diff --git a/__pycache__/exercise.cpython-36.pyc b/__pycache__/exercise.cpython-36.pyc
new file mode 100644
index 0000000..7ca6b3c
Binary files /dev/null and b/__pycache__/exercise.cpython-36.pyc differ
diff --git a/exercise.py b/exercise.py
index 0ae90ce..4eaf18d 100644
--- a/exercise.py
+++ b/exercise.py
@@ -1,12 +1,34 @@
+"""
+Run:
+    python -m doctest -v exercise.py
+"""
+
 # problem 1
 # ------------------------------------------------------------------- #
 people = ['Bob Smith', 'Ken Jones', 'Alex Bradino']
 
 
 def sort_by_last_name(people, order):
+
+    """
+    Takes a list fo full names sorts by last name in either assending or descending order
+
+    arguments:  list of names
+                Assending('A') or Descending ('D')
+
+    return: sorted list
+    Doctests:
+        >>> sort_by_last_name(['Bob Smith', 'Ken Jones', 'Alex Bradino'],'A')
+        ['Alex Bradino', 'Ken Jones', 'Bob Smith'] 
+    """
     # return full names sorted by last name in either ascending or descending order
     # add doctests make sure it passes
-    pass
+
+    if order == 'A':
+        return(sorted(people, key=lambda x: x.split()[1]))
+    else:
+        return(sorted(people, key=lambda x: x.split()[1], reverse=True))
+ #   pass
 
 
 # problem 2
@@ -16,17 +38,41 @@ def sort_by_last_name(people, order):
 
 
 def create_dictionary_from_lists(names, ages):
+    """
+    Takes a list of names and adds ages to it to create a new list
+
+    arguments:  list of names
+                list of ages
+
+    return: new dictionary of names and ages
+    Doctests:
+        >>> create_dictionary_from_lists(['James', 'Susan', 'Maggie'],[4, 9, 12])
+        {'James':4, 'Susan':9, 'Maggie':12}
+    """    
     # {'James':4, 'Susan':9, 'Maggie':12}
     # add doctests make sure it passes
-    pass
+
+    return dict(zip(names, ages))
+
 
 
 # problem 3
 # ------------------------------------------------------------------- #
 numbers = [5, 6, 7, 8, 9, 10, 11, 12]
-
+  
 
 def square_even_values_and_sum_under_10(numbers):
+    """
+    Takes a list of numbers and sums the squares of a list of numbers under 10
+
+    arguments:  list of numbers
+
+    return: sum of squares
+    Doctests:
+        >>> square_even_values_and_sum_under_10([5, 6, 7, 8, 9, 10, 11, 12])
+        100
+    """ 
     # 6^2 + 8^2]
     # add doctests make sure it passes
-    pass
+    #    
+    return sum((n**2) for n in range(numbers) if n%10 == 2 and n <10)
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