diff --git a/my-script.js b/my-script.js
index 5ac970c..4433168 100644
--- a/my-script.js
+++ b/my-script.js
@@ -21,38 +21,76 @@ const greeting = (name) => {
 /**
  * Write a function called `add` that returns the sum of two numbers
  */
-
+const add = (x,y) => x+y;
 
 /**
  * Write a function called `subtract` that returns the difference between two numbers
  */
 
-
+const subtract = (x, y) => x - y;
 /**
  * Write a function called `min` that returns the smaller of two numbers
  */
-
+const min = function (x,y) {
+  if (x === y) {
+    return null;
+  } else if (x > y) {
+    return y;
+  } else {
+    return x;
+  }
+}
 
 /**
  * Write a function called `max` that returns the larger of two numbers
  */
-
+const max = function (x,y) {
+  if (x===y) {
+    return null;
+  } else if (x > y){
+    return x;
+  } else {
+    return y;
+  }
+}
 /**
  * Write a function called `isEven` that takes a single value and
  * returns `true` if it is even and `false` if it is odd
  */
-
+const isEven = function (n) {
+  if (n % 2 === 0) {
+    return true;
+  } else if (n % 2 === 1) {
+    return false;
+  } else {
+    return isEven(n + 2);
+  }
+}
 
 /**
  * Write a function called `isOdd` that takes a single value and
  * returns `false` if it is even and `true` if it is odd
  */
-
+const isOdd = function (n) {
+  if (n % 2 === 1) {
+    return true;
+  } else if (n % 2 === 0) {
+    return false;
+  } else {
+    return isOdd(n + 2);
+  }
+}
 
 /**
  * Write a function called `factorial` that takes a single integer and
  * returns the product of the integer and all the integers below it
  */
+const factorial = function (n) {
+  let total = 1;
+  for (i=1; i<= n; i++){
+    total*=i;
+  } return total;
+}
 
 
 /**
@@ -60,7 +98,16 @@ const greeting = (name) => {
  * returns the product of the integer and all the integers below it, but
  * only if they are odd. If the starting number is even, don't include it.
  */
-
+const oddFactorial = function (n) {
+  let total = 1;
+  for (i=1; i<= n; i++){
+    if ( i % 2 === 1) {
+    total*=i;
+  } else if (i % 2 === 0) {
+    total*=1;
+  }
+} return total;
+}
 
 /**
  * Write a function that solves the Chessboard exercise from chapter two,
@@ -68,7 +115,22 @@ const greeting = (name) => {
  * Instead of printing each line using `console.log()`, build the grid using
  * a single string and return it at the end of the function
  */
-
+const chessboard = function (n) {
+let board='';
+for (let line=1; line<= n; line++){
+  for (let character=1; character <= n; character++){
+    if(line % 2 !==0){
+      //odd Lines
+      board += character % 2 !== 0 ? ' ' : '#';
+    } else {
+      //even Lines
+      board += character % 2 !== 0 ? '#': ' ';
+    }
+  }
+    board += '\n';
+  }
+  return board;
+}
 
 /*******************************************
  * DO NOT CHANGE ANYTHING BELOW THIS LINE!