diff --git a/challenges/week_1/checker.py b/challenges/week_1/checker.py
index 50020fc..b90852e 100644
--- a/challenges/week_1/checker.py
+++ b/challenges/week_1/checker.py
@@ -1,4 +1,4 @@
-import bus_fare_challenge
+import bus_fare_challenge as solution
 import datetime
 import unittest
 
@@ -12,7 +12,7 @@ def setUp(self) -> None:
             "Tue": 100,
             "Wed": 100,
             "Thu": 100,
-            "Thu": 100,
+            "Fri": 100,
             "Sat": 60,
             "Sun": 80,
         }
@@ -22,7 +22,7 @@ def test_date(self) -> None:
         Tests whether the date returned by the program is correct.
         """
         actual = self.date
-        given = bus_fare_challenge.date
+        given = solution.date
         self.assertEqual(actual, given, f"Today's date is Wrong by {given - actual}!")
 
     def test_day(self) -> None:
@@ -30,7 +30,7 @@ def test_day(self) -> None:
         Tests whether the day returned by the program is correct.
         """
         actual = self.day
-        given = bus_fare_challenge.day
+        given = solution.day
         self.assertEqual(
             actual, given, f"Today is wrong, expexted {actual} but got {given}!"
         )
@@ -40,7 +40,7 @@ def test_fare(self) -> None:
         Tests whether the fare returned by the program is correct.
         """
         actual = self.charts[self.day]
-        given = bus_fare_challenge.fare
+        given = solution.fare
         self.assertEqual(
             actual, given, f"Fare is wrong, expected {actual} but got {given}!"
         )
diff --git a/challenges/week_5/checker.py b/challenges/week_5/checker.py
new file mode 100644
index 0000000..edc188c
--- /dev/null
+++ b/challenges/week_5/checker.py
@@ -0,0 +1,62 @@
+import unittest
+import pandas as pd
+import numpy as np
+import matplotlib.pyplot as plt
+from sklearn.model_selection import train_test_split
+from sklearn.linear_model import LinearRegression
+from sklearn import metrics
+import linear_regression_solution as solution
+
+
+class TestLinearRegressionChallenge(unittest.TestCase):
+    def setUp(self) -> None:
+        self.df = pd.read_csv(
+            "/home/tim/Dev/DS/Learning/python-bootcamp/challenges/week_5/data.csv",
+            index_col=0,
+        )
+        self.X = np.array(self.df.dropna()["x"]).reshape(-1, 1)
+        self.y = np.array(self.df.dropna()["y"]).reshape(-1, 1)
+        self.performance = solution.performance
+
+    def test_prep_data(self) -> None:
+        actual = self.df.dropna().size
+        given = solution.clean_data.size
+        self.assertEqual(
+            actual,
+            given,
+            f"Expected {actual} but got {given}. Please clean your data off null values!",
+        )
+
+    def test_feature_shape(self) -> None:
+        actual = (970, 1)
+        given = solution.X.shape
+        self.assertEqual(
+            actual,
+            given,
+            f"Expected {actual} but got {given}. Please reshape your features!",
+        )
+        given = solution.y.shape
+        self.assertEqual(
+            actual,
+            given,
+            f"Expected {actual} but got {given}. Please reshape your features!",
+        )
+
+    def test_model_evaluation(self) -> None:
+        actual_type = tuple
+        given_type = type(solution.performance)
+        self.assertEqual(
+            actual_type,
+            given_type,
+            f"Expected {actual_type} but got {given_type}. Model evaluation fuction should return a tuple!",
+        )
+
+
+if __name__ == "__main__":
+
+    print("=========================================================================")
+    print("=========================================================================")
+    print("===== Start: Checking ********************************************* =====")
+    unittest.main(exit=False)
+    print("===== End: Checking ********************************************* =======")
+    print("=========================================================================")
\ No newline at end of file
diff --git a/challenges/week_5/data.csv b/challenges/week_5/data.csv
new file mode 100644
index 0000000..3ac91a8
--- /dev/null
+++ b/challenges/week_5/data.csv
@@ -0,0 +1,1001 @@
+,x,y
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diff --git a/challenges/week_5/linear_regression_challenge.py b/challenges/week_5/linear_regression_challenge.py
new file mode 100644
index 0000000..0b90aa0
--- /dev/null
+++ b/challenges/week_5/linear_regression_challenge.py
@@ -0,0 +1 @@
+# WRITE YOUR CODE SOLUTION HERE
diff --git a/source/week-1/print/input.py b/source/week-1/print/input.py
index b840e8b..251ee73 100644
--- a/source/week-1/print/input.py
+++ b/source/week-1/print/input.py
@@ -1,6 +1,12 @@
-# The input funciton allows you to prompt the user for a value
+# The input function allows you to prompt the user to type something
 
 # You need to declare a variable to hold the value entered by the user
-Name = input('What is your name? ')
+# IMPORTANT: When you declare a variable, it has to start with small letter
+name = input('What is your name? ')
 
-print('Great, your name is '+ Name)
\ No newline at end of file
+print('Great, your name is ' + name)
+
+# The user can type their name on the next line with the \n command / not on the same line as above
+name = input("What is your name?\n")
+
+print('Great, your name is ' + name)
diff --git a/source/week-1/print/print.py b/source/week-1/print/print.py
index ec50927..8b8ce73 100644
--- a/source/week-1/print/print.py
+++ b/source/week-1/print/print.py
@@ -5,7 +5,10 @@
 print('Hello world single quotes')
 
 # Strings can also be enclosed in double quotes
-print("Hello world double quotes")
+print("Hello world - double quotes")
 
-# using print to display integers
-print(188)
\ No newline at end of file
+# using print to display integer / whole numbers
+print(188)
+
+# using print to display float number / real number
+print(99.9)
diff --git a/source/week-1/variables/doing_math.py b/source/week-1/variables/doing_math.py
index 886a322..34acdbb 100644
--- a/source/week-1/variables/doing_math.py
+++ b/source/week-1/variables/doing_math.py
@@ -3,7 +3,8 @@
 first_num = 6
 second_num = 2
 
-# You can peform a variety of math operations on numeric values
+# FIRST WAY OF DOING IT
+"""# You can perform a variety of math operations on numeric values
 print('addition')
 print(first_num + second_num)
 print('subtraction')
@@ -14,3 +15,29 @@
 print(first_num / second_num)
 print ('exponent')
 print(first_num ** second_num)
+"""
+
+# SECOND WAY OF DOING IT
+
+# importing operator module
+import operator
+
+# using add() to add two numbers
+print("The addition of numbers is :", end="")
+print(operator.add(first_num, second_num))
+
+# using sub() to subtract two numbers
+print("The difference of numbers is :", end="")
+print(operator.sub(first_num, second_num))
+
+# using mul() to multiply two numbers
+print("The multiplication of numbers is :", end="")
+print(operator.mul(first_num, second_num))
+
+# using truediv() to divide two numbers
+print("The division of numbers is :", end="")
+print(operator.truediv(first_num, second_num))
+
+# using pow() to find the power of two numbers
+print("The power of numbers is :", end="")
+print(operator.pow(first_num, second_num))
diff --git a/source/week-1/variables/format_strings.py b/source/week-1/variables/format_strings.py
index 6b79588..a6551d3 100644
--- a/source/week-1/variables/format_strings.py
+++ b/source/week-1/variables/format_strings.py
@@ -1,8 +1,21 @@
+# FIRST WAY
+# the capitalize function will return the string with 
+# the first letter uppercase and the rest of the word lowercase
+
+# Ask the user for their first and last name // it does not matter how the user types it:
+# ALEX, alex, aLEX etc. --> it will be saved in the memory as Alex (Fist letter will be with uppercase)
+first_name = input('What is your first name? ').capitalize()
+last_name = input('What is your last name? ').capitalize()
+
+print('Hello ' + first_name + ' ' + last_name)
+
+
+# SECOND WAY
 # Ask the user for their first and last name
 first_name = input('What is your first name? ')
 last_name = input('What is your last name? ')
 
 # the capitalize function will return the string with 
 # the first letter uppercase and the rest of the word lowercase
-print ('Hello ' + first_name.capitalize() + ' ' \
-       + last_name.capitalize())
+print('Hello ' + first_name.capitalize() + ' ' + last_name.capitalize())
+