diff --git a/Boolean.CSharp.Main/Core.cs b/Boolean.CSharp.Main/Core.cs
index e09c536..2bcd2dc 100644
--- a/Boolean.CSharp.Main/Core.cs
+++ b/Boolean.CSharp.Main/Core.cs
@@ -30,7 +30,7 @@ public Car(string Make)
                 }
             */
             
-            Car car = new Car("Volkswagen");
+            Car car = new Car("Volkswagen", "Beetle");
             /*  When the car in instantiated, the constructor is passed a string
              in this case Volkswagen which is a Make of car is passed in.
              Within the constructor the 'string Make' variable has scope within the constructor and assiged to the _make member now visible to the whole class
@@ -41,6 +41,8 @@ Within the constructor the 'string Make' variable has scope within the construct
             
             //TODO: 1.  Change car instantiation code above,  pass in the make AND model. 
 
+
+
             //TIP if you click on the Car class name above, right click and then select 'Go to Definition' it'll take you straight to the code
 
            
@@ -132,10 +134,11 @@ What are the parameters and types?
              */
             Aeroplane plane = new Aeroplane();            
             plane.FlightDetails("LHR", "JFK");
-            
+
             //TODO:  5.  Call the FlightDetails method that sets the cancelled message and  cancel the flight
-           
-           //write code here 
+
+            //write code here 
+            plane.FlightDetails("Flight is cancelled");
 
             return plane;
         }
diff --git a/Boolean.CSharp.Main/Extension.cs b/Boolean.CSharp.Main/Extension.cs
index 80c1db6..7c3a20f 100644
--- a/Boolean.CSharp.Main/Extension.cs
+++ b/Boolean.CSharp.Main/Extension.cs
@@ -12,18 +12,57 @@ public class Extension
         //Implement the following methods:
 
         //TODO: 1. add, which accepts two floats and returns a float (both floats added together)
+        public float add(float val1, float val2)
+        {
+            return val1 + val2;
+        }
 
         //TODO: 2. add, which accepts two doubles and returns a double (both doubles added together)
+        public double add(double val1, double val2)
+        {
+            return val1 + val2;
+        }
 
         //TODO: 3. subtract, which accepts two floats and returns a float (first float minus second float)      
+        public float subtract(float val1, float val2)
+        {
+            return val1 - val2;
+        }
 
         //TODO: 4. subtract, which accepts a String and a char and returns a string with all instances of the provided char removed        
+        public string subtract(string str, char c)
+        {
+            return str.Replace(c.ToString(), "");
+
+        }
 
         //TODO: 5. multiply, which accepts two ints and returns an int (first int multiplied by second int)
+        public int multiply(int val1, int val2)
+        {
+            return val1 * val2;
+        }
 
         //TODO: 6. multiply, which accepts a string and an int, and returns a string containing the provided string as many times as the provided int separated by a comma. E.g. multiply("Hello", 3) -> "Hello,Hello,Hello"
-      
-        //TODO: 7. multiply, which accepts an array of Strings that each contain a number, and an int. The method should return an array of ints that contain the value of multiplying each String number by the provided int E.g. multiply(["2", "7", "3"], 3) -> [6, 21, 9]
+        public string multiply(string str, int val)
+        {
+            string s = "";
+            for(int i = 0; i < val; i++)
+            {
+                s = s + str + ",";
+            }
+            s = s.Remove(s.Length-1, 1);
+            return s;
+        }
 
+        //TODO: 7. multiply, which accepts an array of Strings that each contain a number, and an int. The method should return an array of ints that contain the value of multiplying each String number by the provided int E.g. multiply(["2", "7", "3"], 3) -> [6, 21, 9]
+        public int[] multiply(string[] str, int val)
+        {
+            int[] newlist = new int[str.Count()];
+            for(int i = 0; i < str.Count(); i++)
+            {
+                newlist[i] = int.Parse(str[i]) * val;
+            }
+            return newlist;
+        }
     }
 }
diff --git a/Boolean.CSharp.Main/Misc/Bicycle.cs b/Boolean.CSharp.Main/Misc/Bicycle.cs
index f218c0e..2fbf815 100644
--- a/Boolean.CSharp.Main/Misc/Bicycle.cs
+++ b/Boolean.CSharp.Main/Misc/Bicycle.cs
@@ -8,8 +8,14 @@ namespace Boolean.CSharp.Main.Misc
 {
     public class Bicycle
     {
+        
         private int _wheelCount;
 
+        public Bicycle()
+        {
+            WheelCount = 2;
+        }
+
         public int WheelCount { get; set; }
     }
 }
diff --git a/Boolean.CSharp.Main/Misc/Car.cs b/Boolean.CSharp.Main/Misc/Car.cs
index d810f5f..2dde0d8 100644
--- a/Boolean.CSharp.Main/Misc/Car.cs
+++ b/Boolean.CSharp.Main/Misc/Car.cs
@@ -17,10 +17,10 @@ public Car()
             _model = string.Empty;
             _make = string.Empty;
         }
-        public Car(string Make)
+        public Car(string Make, string Model)
         {
             _make = Make;
-            _model = string.Empty;
+            _model = Model;
         }
 
         public string Make
diff --git a/Boolean.CSharp.Main/Misc/Motorbike.cs b/Boolean.CSharp.Main/Misc/Motorbike.cs
index 6fcf20b..700ad8a 100644
--- a/Boolean.CSharp.Main/Misc/Motorbike.cs
+++ b/Boolean.CSharp.Main/Misc/Motorbike.cs
@@ -22,6 +22,7 @@ public Motorbike()
 
         public Motorbike(string Make, string Model)
         {
+            _cc = 373;
             _make = Make;
             _model = Model;
         }
diff --git a/Boolean.CSharp.Main/Misc/Unicycle.cs b/Boolean.CSharp.Main/Misc/Unicycle.cs
index 461cb23..f011476 100644
--- a/Boolean.CSharp.Main/Misc/Unicycle.cs
+++ b/Boolean.CSharp.Main/Misc/Unicycle.cs
@@ -9,7 +9,10 @@ namespace Boolean.CSharp.Main.Misc
     public class Unicycle
     {
         private string _nameOfUnicyclist;
-
+        public Unicycle()
+        {
+            _nameOfUnicyclist = "Oyvind Husveg";
+        }
         public string NameOfUnicyclist { get => _nameOfUnicyclist; set => _nameOfUnicyclist = value; }
         public int WheelCount { get; set; } = 1;
     }