Passed all tests.

Boolean.CSharp.Main/Core.cs

@@ -30,20 +30,20 @@ public Car(string Make)
                 }
             */
 
-            Car car = new Car("Volkswagen");
+            //Car car = new Car("Volkswagen");
             /*  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
              You can pass multiple variables in by placing a comma after the first, then the next variable
             e.g. In the Constructor signature:     public Car(string Make, string Model) 
             e.g. Instantiating:                    Car car = new Car("Volkswagen", "Beetle");
             */
-
-            //TODO: 1.  Change car instantiation code above,  pass in the make AND model. 
 
+            //TODO: 1.  Change car instantiation code above,  pass in the make AND model.
+            Car car = new Car("Volkswagen", "Beetle");
             //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
 
-           
+
 
 
             return car;
@@ -92,7 +92,7 @@ public Bicycle Question3()
             //See there is somewhere to store the number of wheels the bike has 
             //but no constructor to set this
             //TODO: 3. Add a constructor to the Bicycle class that populates the _wheelCount variable
-            Bicycle bike = new Bicycle();
+            Bicycle bike = new Bicycle(2);
 
             return bike;
 
@@ -108,7 +108,7 @@ public Unicycle Question4()
 
             //TIP  see we already have an internal member for the unicyclist name:  _nameOfUnicyclist so you can use this to store the name internally
             //      it is good practice to name internal class variable with an _ at the beginning
-            Unicycle unicycle = new Unicycle();
+            Unicycle unicycle = new Unicycle("Jonatan");
 
 
 
@@ -132,8 +132,9 @@ 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
+            plane.FlightDetails("Flight is cancelled");
 
            //write code here 
 

Boolean.CSharp.Main/Extension.cs

@@ -12,18 +12,60 @@ 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 numOne, float numTwo)
+        {
+            return numOne + numTwo;
+        }
 
         //TODO: 2. add, which accepts two doubles and returns a double (both doubles added together)
+        public double add (double numOne, double numTwo)
+        {
+            return numOne + numTwo;
+        }
 
         //TODO: 3. subtract, which accepts two floats and returns a float (first float minus second float)      
+        public float subtract(float numOne, float numTwo)
+        {
+            return numOne - numTwo;
+        }
 
         //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 text, char c)
+        {
+            string result = text.Replace(c.ToString(), "");
+            return result;
+        }
 
         //TODO: 5. multiply, which accepts two ints and returns an int (first int multiplied by second int)
+        public int multiply (int numOne, int numTwo)
+        {
+            return numOne * numTwo;
+        }
 
         //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 text, int number)
+        {
+
+            string result = $"{text}";
+            for (int i = 0; i < number-1; i++)
+            {
+                result += $",{text}";
+                Console.WriteLine(result);
+            }
+            return result;
+        }
+        //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[] numberList, int number)
+        {
+            int[] result = new int[numberList.Length];
+            for (int i = 0; i < numberList.Length; i++)
+            {
+                result[i] = int.Parse(numberList[i]) * number;
+            }
+
+            return result;
+        }
     }
 }

Boolean.CSharp.Main/Misc/Bicycle.cs

@@ -11,5 +11,11 @@ public class Bicycle
         private int _wheelCount;
 
         public int WheelCount { get; set; }
+
+        public Bicycle(int wheelCount)
+        {
+            _wheelCount = wheelCount;
+            WheelCount = wheelCount;
+        }
     }
 }

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

Boolean.CSharp.Main/Misc/Motorbike.cs

@@ -22,6 +22,7 @@ public Motorbike()
 
         public Motorbike(string Make, string Model)
         {
+            _cc = 373;
             _make = Make;
             _model = Model;
         }

Boolean.CSharp.Main/Misc/Unicycle.cs

@@ -12,5 +12,10 @@ public class Unicycle
 
         public string NameOfUnicyclist { get => _nameOfUnicyclist; set => _nameOfUnicyclist = value; }
         public int WheelCount { get; set; } = 1;
+
+        public Unicycle(string nameOfUnicyclist)
+        {
+            _nameOfUnicyclist = nameOfUnicyclist;
+        }
     }
 }