diff --git a/.eslintrc.json b/.eslintrc.json
index c945f41..e7cec2a 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -18,7 +18,7 @@
     ],
     "linebreak-style": [
       "error",
-      "unix"
+      "windows"
     ],
     "quotes": [
       "error",
@@ -267,10 +267,12 @@
   },
   "overrides": [
     {
-      "files": ["1-let.js"],
+      "files": [
+        "1-let.js"
+      ],
       "rules": {
         "prefer-const": "off"
       }
     }
   ]
-}
+}
\ No newline at end of file
diff --git a/Exercises/1-let.js b/Exercises/1-let.js
index d705443..d22e831 100644
--- a/Exercises/1-let.js
+++ b/Exercises/1-let.js
@@ -1,5 +1,5 @@
 'use strict';
 
-let name = undefined;
+let name = 'Alex';
 
 module.exports = { name };
diff --git a/Exercises/2-const.js b/Exercises/2-const.js
index 5512738..219cf61 100644
--- a/Exercises/2-const.js
+++ b/Exercises/2-const.js
@@ -1,5 +1,5 @@
 'use strict';
 
-const year = undefined;
+const year = 1992;
 
 module.exports = { year };
diff --git a/Exercises/3-hello.js b/Exercises/3-hello.js
index a597391..458783c 100644
--- a/Exercises/3-hello.js
+++ b/Exercises/3-hello.js
@@ -1,5 +1,5 @@
 'use strict';
 
-const hello = null;
+const hello = name => console.log(`Добро пожаловать ${name}`);
 
 module.exports = { hello };
diff --git a/Exercises/4-range.js b/Exercises/4-range.js
index 31bd852..6cf4035 100644
--- a/Exercises/4-range.js
+++ b/Exercises/4-range.js
@@ -1,5 +1,12 @@
 'use strict';
 
-const range = null;
+const range = (start, end) => {
+  const rangeOfNum = [];
+  for (let i = start; i <= end; i++) {
+    rangeOfNum.push(i);
+  }
+
+  return rangeOfNum;
+};
 
 module.exports = { range };
diff --git a/Exercises/5-range-odd.js b/Exercises/5-range-odd.js
index 54bb5b4..64e5945 100644
--- a/Exercises/5-range-odd.js
+++ b/Exercises/5-range-odd.js
@@ -1,5 +1,16 @@
 'use strict';
 
-const rangeOdd = null;
+const rangeOdd = (start, end) => {
+  const rangeOddNum = [];
+  for (let i = start; i <= end; i++) {
+    const oddNum = Math.abs(i) % 2 === 1;
+    if (oddNum) {
+      rangeOddNum.push(i);
+    }
+  }
+
+  return rangeOddNum;
+};
+
 
 module.exports = { rangeOdd };
diff --git a/Exercises/6-calculate.js b/Exercises/6-calculate.js
index dfecf6b..5e589a9 100644
--- a/Exercises/6-calculate.js
+++ b/Exercises/6-calculate.js
@@ -1,11 +1,20 @@
 'use strict';
 
-const square = null;
+const square = x => x * x;
 
-const cube = null;
+const cube = x => x ** 3;
 
-const average = null;
+const average = (a, b) => (a + b) / 2;
+
+const calculate = () => {
+  const result = [];
+  for (let i = 0; i <= 9; i++) {
+    const aveResult = average(cube(i), square(i));
+    result.push(aveResult);
+  }
+
+  return result;
+};
 
-const calculate = null;
 
 module.exports = { square, cube, average, calculate };
diff --git a/Exercises/7-objects.js b/Exercises/7-objects.js
index 0920026..ffd1d6d 100644
--- a/Exercises/7-objects.js
+++ b/Exercises/7-objects.js
@@ -1,5 +1,14 @@
 'use strict';
 
-const fn = null;
+const fn = () => {
+  const obj1 = { name: 'Саша' };
+  // eslint-disable-next-line prefer-const
+  let obj2 = { name: 'Ксюша' };
+
+  obj1.name = 'Александр';
+  obj2.name = 'Ксения';
+
+  obj2 = { name: 'Ксю' };
+};
 
 module.exports = { fn };
diff --git a/Exercises/8-create.js b/Exercises/8-create.js
index ac27ddd..f400582 100644
--- a/Exercises/8-create.js
+++ b/Exercises/8-create.js
@@ -1,5 +1,5 @@
 'use strict';
 
-const createUser = null;
+const createUser = (name, city) => ({ name, city });
 
 module.exports = { createUser };
diff --git a/Exercises/9-array.js b/Exercises/9-array.js
index 466c69a..ad24600 100644
--- a/Exercises/9-array.js
+++ b/Exercises/9-array.js
@@ -1,7 +1,14 @@
 'use strict';
 
-const phonebook = null;
+const phonebook = [
+  { name: 'Marcus Aurelius', phone: '+380445554433' },
+  { name: 'Alex White', phone: '+380445554434' }
+];
 
-const findPhoneByName = null;
+const findPhoneByName = n => {
+  for (const { name, phone } of phonebook) {
+    if (name === n) return phone;
+  }
+};
 
 module.exports = { phonebook, findPhoneByName };
diff --git a/Exercises/a-hash.js b/Exercises/a-hash.js
index 466c69a..e5d5b50 100644
--- a/Exercises/a-hash.js
+++ b/Exercises/a-hash.js
@@ -1,7 +1,10 @@
 'use strict';
 
-const phonebook = null;
+const phonebook = {
+  'Marcus Aurelius': '+380445554433',
+  'Alex White': '+380445554434'
+};
 
-const findPhoneByName = null;
+const findPhoneByName = name => (phonebook[name]);
 
 module.exports = { phonebook, findPhoneByName };