diff --git a/assignment_1.py b/assignment_1.py
index ad78373..ed4eb8f 100644
--- a/assignment_1.py
+++ b/assignment_1.py
@@ -16,7 +16,8 @@ def lower_case(string):
     """
 
     ### your code starts here
-
+    lower_string = string.lower()
+ 
     ### your code ends here
 
     return lower_string
@@ -34,11 +35,12 @@ def upper_case(string):
 
     Returns:
     upper_string -- upper case version of string
-    
+
     """
 
     ### your code starts here
-
+    upper_string = upper(string)
+    
     ### your code ends here
 
     return upper_string
diff --git a/assignment_2a.py b/assignment_2a.py
index 1b8fc0e..01ce54d 100644
--- a/assignment_2a.py
+++ b/assignment_2a.py
@@ -10,9 +10,12 @@
 just give a correct one.
 """
 
-var_1 = function_2c(...)
 
-var_2 = function_2b(...)
+var_1 = function_2c(1000,5,10,-50)['add']
+
+var_2 = function_2b('Seminars', 'Borrel')['C']
+
+
 
 if var_1 == 950:
     print("Good job!")
diff --git a/assignment_2b.py b/assignment_2b.py
index 1aef416..f6d9562 100644
--- a/assignment_2b.py
+++ b/assignment_2b.py
@@ -5,7 +5,18 @@
 No cheating! Don't show or tell hem the code directly
 """
 def function_2b(string_1, string_2):
+    '''
+    function_2b
+    inputs: 
+    - string_1 (str)
+    - string_2 (str) 
 
+    outputs:
+    - dictionary with: 
+        - C: string_1 and string_2 appended
+        - L: string_1 in lower case
+        - U: string_2 in upper case
+    '''
     lower = string_1.lower()
     upper = string_2.upper()
     combined = string_1 + string_2
diff --git a/assignment_2c.py b/assignment_2c.py
index 1ac1ced..9a44c5b 100644
--- a/assignment_2c.py
+++ b/assignment_2c.py
@@ -5,7 +5,20 @@
 No cheating! Don't show or tell hem the code directly
 """
 def function_2c(w, x, y, z):
+    """
+    This function does various mathematical operations: multiplication, division,
+    addition and subtraction
 
+    Input:
+    w: float, will be multiplied by y and added/substracted to z
+    x: float, will be divided by y
+    y: float
+    z: float, will be added/substracted by z
+
+    Returns a dictionary with the results for each of the 4 operations, with keys
+     'multiply', 'divide', 'add','subtract'
+
+    """
     multiplication = x * y
     division = x / y
     addition = w + z