diff --git a/HomeWork.cs b/HomeWork.cs
index 6e6482c..b316ba4 100644
--- a/HomeWork.cs
+++ b/HomeWork.cs
@@ -152,6 +152,11 @@
 
             Console.WriteLine("Array is: " + "[{0}]", string.Join(", ", array));
         }
+
+        public void PrintArray(double[] array)
+        {
+            Console.WriteLine("[{0}]", string.Join(", ", array));
+        }
         
         public int Task_34(int[] array)
         {
@@ -197,9 +202,87 @@
 
             }
             Console.WriteLine($"\nDev between max element ({maxElement}) and min ({minElement}) is: {resaultHW}");
+        }
+
+        public int[] craeteMass(int size)
+        {
+            int[] array = new int[size];
+            
+            for (int i = 0; i < array.Length; i++)
+            {
+                Console.WriteLine($"Input {i+1} number: ");
+                int number = Convert.ToInt32(Console.ReadLine());
+                array[i] = number;
+            }
+
+            return array;
 
         }
 
+        public int Tak_41(int[] array)
+        {
+            counter = 0;
+            for (int i = 0; i < array.Length; i++)
+            {
+                if(array[i] > 0 ) counter += 1; 
+            }
+            return counter;
+        }
+
+        public double[] Task_43(double b1, double k1, double b2, double k2)
+        {
+            double x = (b2 - b1) / (k1 - k2);
+            double y = k1 * x + b1;
+            double[] dotCross = new[] {x, y};
+
+            return dotCross;
+
+            //          Console.WriteLine("x = " + x + "y = " + y );
+
+        }
+
+        public double[,] Task_47(int rows, int columns)
+        {
+            Random rand = new Random();
+            double[,] newArray = new double[rows, columns];
+            Console.WriteLine("   ");
+            for (int i = 0; i < rows; i++)
+            for (int k = 0; k < columns; k++)
+                newArray[i, k] =  rand.Next(-100, 200) + rand.Next(0, 9) / 10.0;
+            return newArray;
+
+        }
+
+
+        public void Task_50(int[,] array, int rowsIndex, int columnsIndex)
+        {
+            if (rowsIndex > array.GetLength(0) || columnsIndex > array.GetLength(1)) 
+                Console.WriteLine($"Not element in array in [{rowsIndex},{columnsIndex}]");
+
+            else
+                Console.WriteLine("Element  in [{rowsIndex},{columnsIndex}] is: " + array[rowsIndex, columnsIndex]);
+            
+        }
+
+        public void Task_52(int[,] array)
+        {
+            for (int i = 0; i < array.GetLength(0); i++)
+            {
+                int meanArray = 0;
+                int ColChetn = 0;
+                for (int k = 0; k < array.GetLength(1); k++)
+                {
+                    meanArray += array[k, i];
+
+                }
+
+                Console.WriteLine($"Arithmetic mean of column elements {i + 1} = {(float)meanArray / array.GetLength(1)}");
+
+            }
+
+        }
+        
+
 
 
 
diff --git a/README.md b/README.md
index 4764db3..66402f5 100644
--- a/README.md
+++ b/README.md
@@ -27,3 +27,12 @@
 - [X] Task_34
 - [X] Task_36
 - [X] Task_38
+
+## HW6
+- [X] Task_41
+- [X] Task_43
+
+## HW7
+- [X] Task_47
+- [X] Task_50
+- [X] Task_52
diff --git a/Start.cs b/Start.cs
index c4a3b88..bcf4adf 100644
--- a/Start.cs
+++ b/Start.cs
@@ -34,6 +34,7 @@ public class Start
     {
         HomeWork HW = new HomeWork();
         Practics pract = new Practics();
+        Tools myTools = new Tools();
 
         Console.Write("Wich task: ");
         Console.WriteLine("WH2 is 10, 13, 15");
@@ -109,6 +110,56 @@ public class Start
                 //Console.WriteLine("Summ is: " + HW.Task_38(pract.newRandomMass(size2, min2, max2)));
                 HW.Task_38(pract.newRandomMass(size2, min2, max2));
                 break;
+            case 41:
+                Console.WriteLine("Input M numbers");
+                int size3 = Convert.ToInt32(Console.ReadLine());
+                Console.WriteLine("Numbers more then 0 is: "+HW.Tak_41(HW.craeteMass(size3)));
+                break;
+            case 43:
+                Console.WriteLine("Input b1");
+                int b1 = Convert.ToInt32(Console.ReadLine());
+                Console.WriteLine("Input k1");
+                int k1 = Convert.ToInt32(Console.ReadLine());
+                Console.WriteLine("Input b2");
+                int b2 = Convert.ToInt32(Console.ReadLine());
+                Console.WriteLine("Input k2");
+                int k2 = Convert.ToInt32(Console.ReadLine());
+                Console.Write("Dot Cross is:");
+                HW.PrintArray(HW.Task_43(b1, k1, b2, k2));
+                break;
+            
+            case 47:
+                Console.WriteLine("Input number of rows: ");
+                int rows = Convert.ToInt32(Console.ReadLine());
+                Console.WriteLine("Input number of columns: ");
+                int columns = Convert.ToInt32(Console.ReadLine());
+                myTools.ShowDoublet2dArray(HW.Task_47(rows, columns));
+                
+                break;
+            
+            case 50:
+                int[,] data50 = myTools.CreateRandom2dArray(5, 5, -10, 10);
+                myTools.ShowInt2dArray(data50);
+                Console.WriteLine("Input indexRows: ");
+                int indexRows = Convert.ToInt32(Console.ReadLine());
+                Console.WriteLine("Input indexColumns: ");
+                int indexColumns = Convert.ToInt32(Console.ReadLine());
+                HW.Task_50(data50, indexRows, indexColumns);
+                break;
+            
+            case 52:
+                int[,] data52 = myTools.CreateRandom2dArray(4, 4, 0, 3);
+                myTools.ShowInt2dArray(data52);
+                HW.Task_52(data52);
+                
+                break;
+            
+            case 100:
+                int[] data47 = myTools.RiadeLine4data();
+                myTools.ShowInt2dArray(myTools.CreateRandom2dArray(data47[0], data47[1], data47[2], data47[3]));
+                
+                
+                break;
 
 
             default:
@@ -120,8 +171,10 @@ public class Start
     }
     
     static void PracticsTask()
+    
     {
         Practics pract = new Practics();
+        Tools myTools = new Tools();
         
         Console.Write("Wich task: ");
         int taskNumver = Convert.ToInt32(Console.ReadLine());
@@ -202,6 +255,24 @@ public class Start
                 Console.WriteLine("Rwsault is: ");
                 pract.printArray(pract.fibanach(number10));
                 break;
+            
+            case 12:
+                Console.WriteLine("FInput number of rows: ");
+                int rows = Convert.ToInt32(Console.ReadLine());
+                Console.WriteLine("Input number of columns: ");
+                int columns = Convert.ToInt32(Console.ReadLine());
+                Console.WriteLine("Third min");
+                int min2d = Convert.ToInt32(Console.ReadLine());
+                Console.WriteLine("Third max");
+                int max2d = Convert.ToInt32(Console.ReadLine());
+                int[,] myArray = myTools.CreateRandom2dArray(rows, columns, min2d, max2d);
+                myTools.ShowInt2dArray(myArray); 
+                Console.WriteLine(" ");
+                Console.WriteLine("Resault:");
+                int[,] myArrayRev = pract.Task1_8(myArray);
+                myTools.ShowInt2dArray(myArrayRev);
+                
+                break;
 
             default:
                 Console.WriteLine("Wrong task");
diff --git a/Tools.cs b/Tools.cs
new file mode 100644
index 0000000..db8cc9e
--- /dev/null
+++ b/Tools.cs
@@ -0,0 +1,62 @@
+namespace pr;
+
+public class Tools
+{
+
+    public int[] RiadeLine4data()
+    {
+        
+        Console.WriteLine("FInput number of rows: ");
+        int rows = Convert.ToInt32(Console.ReadLine());
+        Console.WriteLine("Input number of columns: ");
+        int columns = Convert.ToInt32(Console.ReadLine());
+        Console.WriteLine("Third min");
+        int min2d = Convert.ToInt32(Console.ReadLine());
+        Console.WriteLine("Third max");
+        int max2d = Convert.ToInt32(Console.ReadLine());
+
+        int[] return4Data = new[] { rows, columns, min2d, max2d };
+
+        return return4Data;
+
+    }
+
+    public int[,] CreateRandom2dArray(int rows, int columns, int minElement, int maxElement)
+    {
+        int[,] newArray = new int[rows, columns];
+        Console.WriteLine("   ");
+        for (int i = 0; i < rows; i++)
+            for (int k = 0; k < columns; k++)
+                newArray[i, k] = new Random().Next(minElement, maxElement + 1 );
+        return newArray;
+
+    }
+
+    public void ShowInt2dArray(int[,] array)
+    {
+        for (int i = 0; i < array.GetLength(0); i++)
+        {
+            for (int k = 0; k < array.GetLength(1); k++)
+                Console.Write("{0,3}", array[i, k]+ " ");
+            Console.WriteLine();
+        }
+
+           
+    }
+    
+    public void ShowDoublet2dArray(double[,] array)
+    {
+        for (int i = 0; i < array.GetLength(0); i++)
+        {
+            for (int k = 0; k < array.GetLength(1); k++)
+                Console.Write("{0,3}", array[i, k]+ " ");
+            Console.WriteLine();
+        }
+
+           
+    }
+
+    
+    
+
+}
\ No newline at end of file
diff --git a/bin/Debug/net6.0/programming_GB.dll b/bin/Debug/net6.0/programming_GB.dll
index 3b72078..afaf36a 100644
Binary files a/bin/Debug/net6.0/programming_GB.dll and b/bin/Debug/net6.0/programming_GB.dll differ
diff --git a/bin/Debug/net6.0/programming_GB.pdb b/bin/Debug/net6.0/programming_GB.pdb
index 827b1b6..c30ddae 100644
Binary files a/bin/Debug/net6.0/programming_GB.pdb and b/bin/Debug/net6.0/programming_GB.pdb differ
diff --git a/obj/Debug/net6.0/programming_GB.csproj.CoreCompileInputs.cache b/obj/Debug/net6.0/programming_GB.csproj.CoreCompileInputs.cache
index 240b3d8..9cd2b4e 100644
--- a/obj/Debug/net6.0/programming_GB.csproj.CoreCompileInputs.cache
+++ b/obj/Debug/net6.0/programming_GB.csproj.CoreCompileInputs.cache
@@ -1 +1 @@
-1cea4dc6da66272d27938ece339a31c45c8e4364
+1a10cf6e18fc3b5ef76d1e32c50a876abd8d08f3
diff --git a/obj/Debug/net6.0/programming_GB.dll b/obj/Debug/net6.0/programming_GB.dll
index 3b72078..afaf36a 100644
Binary files a/obj/Debug/net6.0/programming_GB.dll and b/obj/Debug/net6.0/programming_GB.dll differ
diff --git a/obj/Debug/net6.0/programming_GB.pdb b/obj/Debug/net6.0/programming_GB.pdb
index 827b1b6..c30ddae 100644
Binary files a/obj/Debug/net6.0/programming_GB.pdb and b/obj/Debug/net6.0/programming_GB.pdb differ
diff --git a/obj/Debug/net6.0/ref/programming_GB.dll b/obj/Debug/net6.0/ref/programming_GB.dll
index 9df3791..dd3ceee 100644
Binary files a/obj/Debug/net6.0/ref/programming_GB.dll and b/obj/Debug/net6.0/ref/programming_GB.dll differ
diff --git a/obj/Debug/net6.0/refint/programming_GB.dll b/obj/Debug/net6.0/refint/programming_GB.dll
index 9df3791..dd3ceee 100644
Binary files a/obj/Debug/net6.0/refint/programming_GB.dll and b/obj/Debug/net6.0/refint/programming_GB.dll differ