diff --git a/__tests__/09-word-problems.test.js b/__tests__/09-word-problems.test.js
index 64d4ee5d..070f2cdd 100644
--- a/__tests__/09-word-problems.test.js
+++ b/__tests__/09-word-problems.test.js
@@ -188,7 +188,7 @@ describe("compareLocations()", () => {
   });
 });
 
-describe("gradeAssignments()", () => {
+describe ("gradeAssignments()", () => {
   test("should, for PASS-FAIL assignments, add a `status` of PASSED if the `score.received` equals the `score.max", () => {
     const assignments = [{ kind: "PASS-FAIL", score: { received: 4, max: 4 } }];
     const actual = gradeAssignments(assignments);
diff --git a/package-lock.json b/package-lock.json
index d72a0a81..0a73c8e8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1308,14 +1308,20 @@
       }
     },
     "node_modules/caniuse-lite": {
-      "version": "1.0.30001244",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001244.tgz",
-      "integrity": "sha512-Wb4UFZPkPoJoKKVfELPWytRzpemjP/s0pe22NriANru1NoI+5bGNxzKtk7edYL8rmCWTfQO8eRiF0pn1Dqzx7Q==",
-      "dev": true,
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/browserslist"
-      }
+      "version": "1.0.30001423",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001423.tgz",
+      "integrity": "sha512-09iwWGOlifvE1XuHokFMP7eR38a0JnajoyL3/i87c8ZjRWRrdKo1fqjNfugfBD0UDBIOz0U+jtNhJ0EPm1VleQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/browserslist"
+        },
+        {
+          "type": "tidelift",
+          "url": "https://tidelift.com/funding/github/npm/caniuse-lite"
+        }
+      ]
     },
     "node_modules/chalk": {
       "version": "4.1.1",
@@ -3022,9 +3028,9 @@
       }
     },
     "node_modules/minimatch": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
-      "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
+      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
       "dev": true,
       "dependencies": {
         "brace-expansion": "^1.1.7"
@@ -4980,9 +4986,9 @@
       "dev": true
     },
     "caniuse-lite": {
-      "version": "1.0.30001244",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001244.tgz",
-      "integrity": "sha512-Wb4UFZPkPoJoKKVfELPWytRzpemjP/s0pe22NriANru1NoI+5bGNxzKtk7edYL8rmCWTfQO8eRiF0pn1Dqzx7Q==",
+      "version": "1.0.30001423",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001423.tgz",
+      "integrity": "sha512-09iwWGOlifvE1XuHokFMP7eR38a0JnajoyL3/i87c8ZjRWRrdKo1fqjNfugfBD0UDBIOz0U+jtNhJ0EPm1VleQ==",
       "dev": true
     },
     "chalk": {
@@ -6290,9 +6296,9 @@
       "dev": true
     },
     "minimatch": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
-      "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
+      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
       "dev": true,
       "requires": {
         "brace-expansion": "^1.1.7"
diff --git a/src/01-functions.js b/src/01-functions.js
index 8d772b6a..6ba97699 100644
--- a/src/01-functions.js
+++ b/src/01-functions.js
@@ -9,7 +9,9 @@
  *  alwaysTrue();
  *  //> true
  */
-function alwaysTrue() {}
+function alwaysTrue() {
+  return true;
+}
 
 /**
  * greet()
@@ -24,7 +26,9 @@ function alwaysTrue() {}
  *  greet("Ian");
  *  //> "Hello, Ian."
  */
-function greet() {}
+function greet(name) {
+  return `Hello, ${name}.`;
+}
 
 /**
  * add()
@@ -39,7 +43,9 @@ function greet() {}
  *  add(10, 20);
  *  //> 30
  */
-function add() {}
+function add(a, b) {
+  return a + b;
+}
 
 /**
  * multiply()
@@ -54,7 +60,9 @@ function add() {}
  *  multiply(2, 5);
  *  //> 10
  */
-function multiply() {}
+function multiply(a, b) {
+  return a * b;
+}
 
 /**
  * average()
@@ -74,7 +82,9 @@ function multiply() {}
  *  average(10, 6);
  *  //> 8 // 10 + 6 = 16; 16/2 = 8;
  */
-function average() {}
+function average(a, b) {
+  return (a + b) / 2;
+}
 
 /**
  * averageThree()
@@ -93,7 +103,9 @@ function average() {}
  *  averageThree(10, 11, 19);
  *  //> 10 // 10 + 11 + 19 = 30; 30 / 3 = 10;
  */
-function averageThree() {}
+function averageThree(a, b, c) {
+  return (a + b + c) / 3;
+}
 
 /**
  * compareTypes()
@@ -112,7 +124,13 @@ function averageThree() {}
  *  compareTypes("left", 10);
  *  //> false
  */
-function compareTypes() {}
+function compareTypes(a, b) {
+  if (typeof a === typeof b) {
+    return true;
+  } else {
+    return false;
+  }
+}
 
 /**
  * flipSign()
@@ -131,7 +149,14 @@ function compareTypes() {}
  *  flipSign(50);
  *  //> -50
  */
-function flipSign() {}
+function flipSign(a) {
+  let str = a.toString()
+  if (str.includes('-')) {
+    return Math.abs(a);
+  } else {
+    return -Math.abs(a);
+  }
+}
 
 /**
  * joinStringsWithSpaces()
@@ -151,7 +176,9 @@ function flipSign() {}
  *  joinStringsWithSpaces("left", "right", "up", "down", "away");
  *  //> "left right up down away"
  */
-function joinStringsWithSpaces() {}
+function joinStringsWithSpaces(a, b, c, d, e) {
+  return a + " " + b + " " + c + " " + d + " " + e;
+}
 
 /**
  * getFirstAndLastCharacter()
@@ -168,7 +195,11 @@ function joinStringsWithSpaces() {}
  *  getFirstAndLastCharacter("upwards");
  *  //> "us"
  */
-function getFirstAndLastCharacter() {}
+function getFirstAndLastCharacter(a) {
+  let first = a.charAt(0);
+  let last = a.charAt(a.length -1);
+  return `${first}${last}`;
+}
 
 // Do not change the code below.
 module.exports = {
diff --git a/src/02-data-types.js b/src/02-data-types.js
index 79cf96cf..e91cabc2 100644
--- a/src/02-data-types.js
+++ b/src/02-data-types.js
@@ -9,7 +9,9 @@
  *  getLengthOfString("down");
  *  //> 4
  */
-function getLengthOfString(str) {}
+function getLengthOfString(str) {
+  return str.length;
+}
 
 /**
  * convertToNumber()
@@ -22,7 +24,9 @@ function getLengthOfString(str) {}
  *  convertToNumber("111");
  *  //> 111
  */
-function convertToNumber(val) {}
+function convertToNumber(val) {
+  return Number(val);
+}
 
 /**
  * convertToString()
@@ -36,7 +40,9 @@ function convertToNumber(val) {}
  *  convertToString(99);
  *  //> "99"
  */
-function convertToString(val) {}
+function convertToString(val) {
+  return val.toString();
+}
 
 /**
  * convertToShoutingText()
@@ -49,7 +55,9 @@ function convertToString(val) {}
  *  convertToShoutingText("Hello There");
  *  //> "HELLO THERE"
  */
-function convertToShoutingText(text) {}
+function convertToShoutingText(text) {
+  return text.toUpperCase();
+}
 
 /**
  * convertToWhisperText()
@@ -62,7 +70,9 @@ function convertToShoutingText(text) {}
  *  convertToWhisperText("Hello There");
  *  //> "hello there"
  */
-function convertToWhisperText(text) {}
+function convertToWhisperText(text) {
+  return text.toLowerCase();
+}
 
 /**
  * checkIfCharacterIsInString()
@@ -79,7 +89,9 @@ function convertToWhisperText(text) {}
  *  checkIfCharacterIsInString("hello there", "a");
  *  //> false
  */
-function checkIfCharacterIsInString(text, character) {}
+function checkIfCharacterIsInString(text, character) {
+  return text.includes(character);
+}
 
 /**
  * isEven()
@@ -95,7 +107,13 @@ function checkIfCharacterIsInString(text, character) {}
  *  isEven(11);
  *  //> false
  */
-function isEven(num) {}
+function isEven(num) {
+  if (num % 2 === 0) {
+    return true;
+  } else {
+    return false;
+  }
+}
 
 /**
  * isOdd()
@@ -111,7 +129,13 @@ function isEven(num) {}
  *  isOdd(11);
  *  //> true
  */
-function isOdd(num) {}
+function isOdd(num) {
+  if (num % 2 === 1) {
+    return true;
+  } else {
+    return false;
+  }
+}
 
 /**
  * isTruthy()
@@ -127,7 +151,9 @@ function isOdd(num) {}
  *  isTruthy(null);
  *  //> false
  */
-function isTruthy(val) {}
+function isTruthy(val) {
+  return Boolean(val);
+}
 
 /**
  * isFalsy()
@@ -143,7 +169,13 @@ function isTruthy(val) {}
  *  isFalsy(" ");
  *  //> false
  */
-function isFalsy(val) {}
+function isFalsy(val) {
+  if (!Boolean(val)) {
+    return true;
+  } else {
+    return false;
+  }
+}
 
 // Do not change the code below.
 module.exports = {
diff --git a/src/03-control-flow.js b/src/03-control-flow.js
index 8f675935..3d525081 100644
--- a/src/03-control-flow.js
+++ b/src/03-control-flow.js
@@ -14,7 +14,13 @@
  *  isEqual(10, "10");
  *  //> false
  */
-function isEqual(a, b) {}
+function isEqual(a, b) {
+  if (a === b) {
+    return true;
+  } else {
+    return false;
+  }
+}
 
 /**
  * findLarger()
@@ -28,7 +34,13 @@ function isEqual(a, b) {}
  *  findLarger(19, 7);
  *  //> 19
  */
-function findLarger(a, b) {}
+function findLarger(a, b) {
+  if (a > b) {
+    return a;
+  } else {
+    return b;
+  }
+}
 
 /**
  * findLargerOrTie()
@@ -45,7 +57,15 @@ function findLarger(a, b) {}
  *  findLargerOrTie(0, 0);
  *  //> "tie"
  */
-function findLargerOrTie(a, b) {}
+function findLargerOrTie(a, b) {
+  if (a > b) {
+    return a;
+  } else if (a < b) {
+    return b;
+  } else {
+    return "tie";
+  }
+}
 
 /**
  * positiveNegativeOrZero()
@@ -65,7 +85,16 @@ function findLargerOrTie(a, b) {}
  *  positiveNegativeOrZero(1);
  *  //> "Positive"
  */
-function positiveNegativeOrZero(a) {}
+function positiveNegativeOrZero(a) {
+  let str = a.toString();
+  if (str.includes('-')) {
+    return "Negative";
+  } else if (a === 0) {
+    return "Zero";
+  } else {
+    return "Positive";
+  }
+}
 
 /**
  * aroundTheWorldGreeting()
@@ -86,7 +115,17 @@ function positiveNegativeOrZero(a) {}
  *  aroundTheWorldGreeting();
  *  //> "Hello World"
  */
-function aroundTheWorldGreeting(language) {}
+function aroundTheWorldGreeting(language) {
+  if (language === "english") {
+    return "Hello World";
+  } else if (language === "spanish") {
+    return "Hola Mundo";
+  } else if (language === "german") {
+    return "Hallo Welt";
+  } else {
+    return "Hello World";
+  } 
+}
 
 /**
  * aroundTheWorldGreetingWithSwitch()
@@ -109,7 +148,21 @@ function aroundTheWorldGreeting(language) {}
  *  aroundTheWorldGreetingWithSwitch();
  *  //> "Hello World"
  */
-function aroundTheWorldGreetingWithSwitch(language) {}
+function aroundTheWorldGreetingWithSwitch(language) {
+  switch(language) {
+    case "english":
+      return "Hello World";
+      break;
+    case "spanish":
+      return "Hola Mundo";
+      break;
+    case "german":
+      return "Hallo Welt";
+      break;
+    default:
+      return "Hello World";
+  }
+}
 
 /**
  * calculateLetterGrade()
@@ -128,7 +181,24 @@ function aroundTheWorldGreetingWithSwitch(language) {}
  *  calculateLetterGrade(99);
  *  //> "A"
  */
-function calculateLetterGrade(grade) {}
+function calculateLetterGrade(grade) {
+  switch (true) {
+    case grade >= 90:
+      return "A";
+      break;
+    case grade >= 80:
+      return "B";
+      break;
+    case grade >= 70:
+      return "C";
+      break;
+    case grade >= 60:
+      return "D";
+      break;
+    default:
+      return "F";
+  }
+}
 
 /**
  * animalCounts()
@@ -146,7 +216,13 @@ function calculateLetterGrade(grade) {}
  *  animalCounts("pig", 1);
  *  //> "1 pig"
  */
-function animalCounts(animal, numberOfAnimals) {}
+function animalCounts(animal, numberOfAnimals) {
+  if (numberOfAnimals > 1) {
+    return `${numberOfAnimals} ${animal}s`;
+  } else {
+    return `1 ${animal}`;
+  }
+}
 
 /**
  * evenOrOdd()
@@ -163,7 +239,13 @@ function animalCounts(animal, numberOfAnimals) {}
  *  evenOrOdd(48);
  *  //> "Even"
  */
-function evenOrOdd(a) {}
+function evenOrOdd(a) {
+  if (a % 2 === 0) {
+    return "Even";
+  } else {
+    return "Odd";
+  }
+}
 
 /**
  * evenOrOddWithTernary()
@@ -179,7 +261,9 @@ function evenOrOdd(a) {}
  *  evenOrOddWithTernary(8);
  *  //> "Even"
  */
-function evenOrOddWithTernary(a) {}
+function evenOrOddWithTernary(a) {
+  return (a % 2 === 0) ? "Even" : "Odd";
+}
 
 // Do not change any code below this line.
 module.exports = {
diff --git a/src/04-arrays.js b/src/04-arrays.js
index 5317f7c3..b8587e76 100644
--- a/src/04-arrays.js
+++ b/src/04-arrays.js
@@ -10,7 +10,10 @@
  *  createEmptyArray();
  *  //> []
  */
-function createEmptyArray() {}
+function createEmptyArray() {
+  let arr = [];
+  return arr;
+}
 
 /**
  * createArrayWithTwoElements()
@@ -24,7 +27,10 @@ function createEmptyArray() {}
  *  createArrayWithTwoElements(true, false);
  *  //> [ true, false ]
  */
-function createArrayWithTwoElements(a, b) {}
+function createArrayWithTwoElements(a, b) {
+  let arr = [a, b];
+  return arr;
+}
 
 /**
  * getArrayLength()
@@ -37,7 +43,9 @@ function createArrayWithTwoElements(a, b) {}
  *  getArrayLength([ 10, 20, 30 ]);
  *  //> 3
  */
-function getArrayLength(array) {}
+function getArrayLength(array) {
+  return array.length;
+}
 
 /**
  * getFirstElementOfArray()
@@ -51,7 +59,9 @@ function getArrayLength(array) {}
  *  getFirstElementOfArray([ 10, 20, 30 ]);
  *  //> 10
  */
-function getFirstElementOfArray(array) {}
+function getFirstElementOfArray(array) {
+  return array[0];
+}
 
 /**
  * getLastElementOfArray()
@@ -65,7 +75,9 @@ function getFirstElementOfArray(array) {}
  *  getLastElementOfArray([ null, undefined ]);
  *  //> undefined
  */
-function getLastElementOfArray(array) {}
+function getLastElementOfArray(array) {
+  return array[array.length - 1];
+}
 
 /**
  * addElementToEndOfArray()
@@ -79,7 +91,10 @@ function getLastElementOfArray(array) {}
  *  addElementToEndOfArray([ 10 ], 9);
  *  //> [ 10, 9 ]
  */
-function addElementToEndOfArray(array, element) {}
+function addElementToEndOfArray(array, element) {
+  array.push(element);
+  return array;
+}
 
 /**
  * removeElementFromEndOfArray()
@@ -92,7 +107,10 @@ function addElementToEndOfArray(array, element) {}
  *  removeElementFromEndOfArray([ 10, 9, 8 ]);
  *  //> 8
  */
-function removeElementFromEndOfArray(array) {}
+function removeElementFromEndOfArray(array) {
+  let removed = array.pop();
+  return removed;
+}
 
 /**
  * addElementToFrontOfArray()
@@ -106,7 +124,10 @@ function removeElementFromEndOfArray(array) {}
  *  addElementToFrontOfArray([ 10 ], 9);
  *  //> [ 9, 10 ]
  */
-function addElementToFrontOfArray(array, element) {}
+function addElementToFrontOfArray(array, element) {
+  array.unshift(element);
+  return array;
+}
 
 /**
  * removeElementFromFrontOfArray()
@@ -119,7 +140,10 @@ function addElementToFrontOfArray(array, element) {}
  *  removeElementFromFrontOfArray([ 10, 9, 8 ]);
  *  //> 10
  */
-function removeElementFromFrontOfArray(array) {}
+function removeElementFromFrontOfArray(array) {
+  let removed = array.shift();
+  return removed;
+}
 
 /**
  * getMiddleElement()
@@ -135,7 +159,9 @@ function removeElementFromFrontOfArray(array) {}
  *  getMiddleElement([ 10, null, "30" ]);
  *  //> null
  */
-function getMiddleElement(array) {}
+function getMiddleElement(array) {
+  return array[Math.floor(array.length / 2)];
+}
 
 // Do not change any code below this line.
 module.exports = {
diff --git a/src/05-objects.js b/src/05-objects.js
index 3e97313c..141bf471 100644
--- a/src/05-objects.js
+++ b/src/05-objects.js
@@ -9,7 +9,10 @@
  *  createEmptyObject()
  *  //> {}
  */
-function createEmptyObject() {}
+function createEmptyObject() {
+  let obj = {};
+  return obj;
+}
 
 /**
  * createObjectWithValue()
@@ -22,7 +25,12 @@ function createEmptyObject() {}
  *  createObjectWithValue(19);
  *  //> { whateverKey: 19 }
  */
-function createObjectWithValue(val) {}
+function createObjectWithValue(val) {
+  let obj = {
+    whateverKey: val
+  }
+  return obj;
+}
 
 /**
  * createObjectWithKey()
@@ -35,7 +43,11 @@ function createObjectWithValue(val) {}
  *  createObjectWithKey("left");
  *  //> { left: false }
  */
-function createObjectWithKey(key) {}
+function createObjectWithKey(key) {
+  let obj = {};
+  obj[key] = '';
+  return obj;
+}
 
 /**
  * createObjectWithKeyValuePair()
@@ -49,7 +61,11 @@ function createObjectWithKey(key) {}
  *  createObjectWithKeyValuePair("left", "right");
  *  //> { left: "right" }
  */
-function createObjectWithKeyValuePair(key, val) {}
+function createObjectWithKeyValuePair(key, val) {
+  let obj = {};
+  obj[key] = val;
+  return obj;
+}
 
 /**
  * getNameFromObject()
@@ -58,11 +74,13 @@ function createObjectWithKeyValuePair(key, val) {}
  * @param {Object} object
  * @returns {*}
  *
- * EXAMPLE:
+ * EXAMPLE:ZAX
  *  getNameFromObject({ name: "Jay" });
  *  //> "Jay"
  */
-function getNameFromObject(object) {}
+function getNameFromObject(object) {
+  return object.name;
+}
 
 /**
  * getAgeFromObject()
@@ -75,7 +93,9 @@ function getNameFromObject(object) {}
  *  getAgeFromObject({ age: 30 });
  *  //> 30
  */
-function getAgeFromObject(object) {}
+function getAgeFromObject(object) {
+  return object.age;
+}
 
 /**
  * addValueToObject()
@@ -89,7 +109,10 @@ function getAgeFromObject(object) {}
  *  addValueToObject({ left: true }, false);
  *  //> { left: true, key: false }
  */
-function addValueToObject(object, val) {}
+function addValueToObject(object, val) {
+  object.anything = val;
+  return object;
+}
 
 /**
  * addKeyToObject()
@@ -103,7 +126,10 @@ function addValueToObject(object, val) {}
  *  addKeyToObject({ right: false }, "left");
  *  //> { right: false, left: true }
  */
-function addKeyToObject(object, key) {}
+function addKeyToObject(object, key) {
+  object[key] = '';
+  return object;
+}
 
 /**
  * addKeyValuePairToObject()
@@ -118,7 +144,10 @@ function addKeyToObject(object, key) {}
  *  addKeyValuePairToObject({ up: true }, "left", false);
  *  //> { up: true, left: false }
  */
-function addKeyValuePairToObject(object, key, val) {}
+function addKeyValuePairToObject(object, key, val) {
+  object[key] = val;
+  return object;
+}
 
 /**
  * deleteKeyFromObject()
@@ -132,7 +161,10 @@ function addKeyValuePairToObject(object, key, val) {}
  *  deleteKeyFromObject({ left: true, right: false }, "left");
  *  //> { right: false }
  */
-function deleteKeyFromObject(object, key) {}
+function deleteKeyFromObject(object, key) {
+  delete object[key];
+  return object;
+}
 
 // Do not change any code below this line.
 module.exports = {
diff --git a/src/06-loops.js b/src/06-loops.js
index 1116cc27..8b8d1476 100644
--- a/src/06-loops.js
+++ b/src/06-loops.js
@@ -11,7 +11,12 @@
  *  //> 25
  *  (3 + 4 + 5 + 6 + 7 = 25)
  */
-function rangeSum(min, max) {}
+function rangeSum(min, max) {
+  for (let i = min; i < max; i++) {
+    min += i + 1;
+  }
+  return min;
+}
 
 /**
  * rangeOdd()
@@ -25,7 +30,15 @@ function rangeSum(min, max) {}
  *  rangeOdd(10, 15);
  *  //> [ 15, 13, 11 ]
  */
-function rangeOdd(min, max) {}
+function rangeOdd(min, max) {
+  let arr = [];
+  for (let i = max; i >= min; i--) {
+    if (i % 2 === 1) {
+      arr.push(i);
+    }
+  }
+  return arr
+}
 
 /**
  * rangeEveryOther()
@@ -39,7 +52,13 @@ function rangeOdd(min, max) {}
  *  rangeEveryOther(11, 18);
  *  //> [ 11, 13, 15, 17 ]
  */
-function rangeEveryOther(min, max) {}
+function rangeEveryOther(min, max) {
+  let arr = [];
+  for (let i = min; i <= max; i+=2) {
+    arr.push(i);
+  }
+  return arr;
+}
 
 /**
  * containsWhileLoop()
@@ -61,7 +80,17 @@ function rangeEveryOther(min, max) {}
  *  containsWhileLoop([ "left", "up", "right" ], "down");
  *  //> false
  */
-function containsWhileLoop(array, target) {}
+function containsWhileLoop(array, target) {
+  let i = 0; 
+  let trueFalse = false;
+  while (i <= array.length) {
+    if (array[i] === target) {
+      trueFalse = true;
+    }
+  i++;
+  }
+  return trueFalse;
+}
 
 /**
  * containsForLoop()
@@ -83,7 +112,15 @@ function containsWhileLoop(array, target) {}
  *  containsForLoop([ "left", "up", "right" ], "down");
  *  //> false
  */
-function containsForLoop(array, target) {}
+function containsForLoop(array, target) {
+  let trueFalse = false;
+  for (let i = 0; i <= array.length; i++) {
+    if (array[i] === target) {
+      trueFalse = true;
+    }
+  }
+  return trueFalse;
+}
 
 /**
  * targetCount()
@@ -97,7 +134,15 @@ function containsForLoop(array, target) {}
  *  targetCount([ 10, 20, 10, 20, 30 ], 10);
  *  //> 2
  */
-function targetCount(array, target) {}
+function targetCount(array, target) {
+  let count = 0;
+  for (let i = 0; i <= array.length; i++) {
+    if (array[i] === target) { 
+      count++;
+    } 
+    }
+  return count;
+}
 
 /**
  * firstIndexFound()
@@ -117,7 +162,16 @@ function targetCount(array, target) {}
  *  firstIndexFound([ "left", "right", "left" ], "up");
  *  //> -1
  */
-function firstIndexFound(array, target) {}
+function firstIndexFound(array, target) {
+  let count = -1
+  for (let i = 0; i <= array.length; i++) {
+    if (array[i] === target) { 
+      count = i;
+      break;
+    } 
+    }
+  return count;
+}
 
 /**
  * lastIndexFound()
@@ -137,7 +191,15 @@ function firstIndexFound(array, target) {}
  *  lastIndexFound([ "left", "right", "left" ], "up");
  *  //> -1
  */
-function lastIndexFound(array, target) {}
+function lastIndexFound(array, target) {
+  let count = -1
+  for (let i = 0; i <= array.length; i++) {
+    if (array[i] === target) { 
+      count = i;
+    } 
+    }
+  return count;
+}
 
 /**
  * timesIndex()
@@ -151,7 +213,15 @@ function lastIndexFound(array, target) {}
  *  //> [ 7 * 0, 10 * 1, 11 * 2 ]
  *  //> [ 0, 10, 22 ]
  */
-function timesIndex(array) {}
+function timesIndex(array) {
+  let arr = [];
+  let multiplied = 0;
+  for (let i = 0; i < array.length; i++) {
+    multiplied = array[i] * i;
+    arr.push(multiplied); 
+  }
+  return arr;
+}
 
 /**
  * cumulativeSum()
@@ -165,7 +235,15 @@ function timesIndex(array) {}
  *  //> [ 5, 5 + 2, 5 + 2 + 9 ]
  *  //> [ 5, 7, 16 ]
  */
-function cumulativeSum(array) {}
+function cumulativeSum(array) {
+  let arr = [];
+  let sum = 0;
+  for (let i = 0; i < array.length; i++) {
+    sum += array[i];
+    arr.push(sum); 
+  }
+  return arr;
+}
 
 // Do not change anything below this line.
 module.exports = {
diff --git a/src/07-even-more-loops.js b/src/07-even-more-loops.js
index 250fde4a..09d941df 100644
--- a/src/07-even-more-loops.js
+++ b/src/07-even-more-loops.js
@@ -12,7 +12,14 @@
  *  shoutForLoop([ "A", "Very", "Happy", "Array" ]);
  *  //> [ "A!", "Very!", "Happy!", "Array!" ];
  */
-function shoutForLoop(array) {}
+function shoutForLoop(array) {
+  arr = [];
+  for (let i = 0; i < array.length; i++) {
+    let newString = `${array[i]}!`;
+    arr.push(newString);
+  }
+  return arr;
+}
 
 /**
  * shoutWhileLoop()
@@ -28,7 +35,16 @@ function shoutForLoop(array) {}
  *  shoutWhileLoop([ "A", "Very", "Happy", "Array" ]);
  *  //> [ "A!", "Very!", "Happy!", "Array!" ];
  */
-function shoutWhileLoop(array) {}
+function shoutWhileLoop(array) {
+  arr = [];
+  let i = 0; 
+  while (i < array.length) {
+    let newString = `${array[i]}!`;
+    arr.push(newString);
+    i++;
+  }
+  return arr;
+}
 
 /**
  * shoutForOfLoop()
@@ -44,7 +60,16 @@ function shoutWhileLoop(array) {}
  *  shoutForOfLoop([ "A", "Very", "Happy", "Array" ]);
  *  //> [ "A!", "Very!", "Happy!", "Array!" ];
  */
-function shoutForOfLoop(array) {}
+function shoutForOfLoop(array) {
+  arr = [];
+  let i = 0; 
+  for(value of array) {
+    let newString = `${array[i]}!`;
+    arr.push(newString);
+    i++;
+  }
+  return arr;
+}
 
 /**
  * sumArray()
@@ -57,7 +82,13 @@ function shoutForOfLoop(array) {}
  *  sumArray([ 10, 0, 10, 11 ]);
  *  //> 31
  */
-function sumArray(array) {}
+function sumArray(array) {
+  let sum = 0;
+  for (let i = 0; i < array.length; i++) {
+    sum += array[i];
+  }
+  return sum;
+}
 
 /**
  * oddArray()
@@ -70,7 +101,15 @@ function sumArray(array) {}
  *  oddArray([ 11, 15, 20, 22, 37 ]);
  *  //> [ 11, 15, 37 ]
  */
-function oddArray(array) {}
+function oddArray(array) {
+  arr = [];
+  for (let i = 0; i < array.length; i++) {
+    if (array[i] % 2 === 1) {
+      arr.push(array[i]);
+    }
+  }
+  return arr;
+}
 
 /**
  * evenArray()
@@ -83,7 +122,15 @@ function oddArray(array) {}
  *  evenArray([ 11, 15, 20, 22, 37 ]);
  *  //> [ 20, 22 ]
  */
-function evenArray(array) {}
+function evenArray(array) {
+  arr = [];
+  for (let i = 0; i < array.length; i++) {
+    if (array[i] % 2 === 0) {
+      arr.push(array[i]);
+    }
+  }
+  return arr;
+}
 
 /**
  * findSmallest()
@@ -96,7 +143,15 @@ function evenArray(array) {}
  *  findSmallest([ 0, 11, -2, 5 ]);
  *  //> -2
  */
-function findSmallest(array) {}
+function findSmallest(array) {
+  smallest = array[0];
+  for (let i = 0; i < array.length; i++) {
+    if (array[i] < smallest) {
+      smallest = array[i];
+    }
+  }
+  return smallest;
+}
 
 /**
  * findLargest()
@@ -109,7 +164,15 @@ function findSmallest(array) {}
  *  findLargest([ 0, 11, -2, 5 ]);
  *  //> 11
  */
-function findLargest(array) {}
+function findLargest(array) {
+  largest = array[0];
+  for (let i = 0; i < array.length; i++) {
+    if (array[i] > largest) {
+      largest = array[i];
+    }
+  }
+  return largest;
+}
 
 /**
  * findEqual()
@@ -126,7 +189,15 @@ function findLargest(array) {}
  *  findEqual([ 0, 11, -2, 5 ], 9);
  *  //> false
  */
-function findEqual(array, selected) {}
+function findEqual(array, selected) {
+  let trueFalse = false;
+  for (let i = 0; i <= array.length; i++) {
+    if (array[i] === selected) {
+      trueFalse = true;
+    }
+  }
+  return trueFalse;
+}
 
 /**
  * removeDuplicates()
@@ -143,7 +214,16 @@ function findEqual(array, selected) {}
  *  //> [ 1, 11, 2, 3, 4, 9 ]
  */
 
-function removeDuplicates(array) {}
+function removeDuplicates(array) {
+  let arr = [];
+  for (let i = 0; i < array.length; i++) {
+    if (arr.includes(array[i])) { 
+    } else {
+      arr.push(array[i]);
+    }
+  }
+  return arr;
+}
 
 // Do not change any code below this line.
 module.exports = {
diff --git a/src/08-accessing.js b/src/08-accessing.js
index 079908aa..b62a9ad5 100644
--- a/src/08-accessing.js
+++ b/src/08-accessing.js
@@ -32,7 +32,9 @@
  *  getFirstName(person);
  *  //> "Rachel"
  */
-function getFirstName(person) {}
+function getFirstName(person) {
+  return person.names.first;
+}
 
 /**
  * getLastName()
@@ -45,7 +47,9 @@ function getFirstName(person) {}
  *  getLastName(person);
  *  //> "Rojas"
  */
-function getLastName(person) {}
+function getLastName(person) {
+  return person.names.last;
+}
 
 /**
  * getAddressStreet()
@@ -58,7 +62,9 @@ function getLastName(person) {}
  *  getAddressStreet(person);
  *  //> "697 Pine Drive"
  */
-function getAddressStreet(person) {}
+function getAddressStreet(person) {
+  return person.address.street;
+}
 
 /**
  * getCountOfPhoneNumbers()
@@ -71,7 +77,9 @@ function getAddressStreet(person) {}
  *  getCountOfPhoneNumbers(person);
  *  //> 2
  */
-function getCountOfPhoneNumbers(person) {}
+function getCountOfPhoneNumbers(person) {
+  return person.numbers.length;
+}
 
 /**
  * getFirstPhoneNumber()
@@ -87,7 +95,9 @@ function getCountOfPhoneNumbers(person) {}
  *  getFirstPhoneNumber(person);
  *  //> 7185550921
  */
-function getFirstPhoneNumber(person) {}
+function getFirstPhoneNumber(person) {
+  return person.numbers[0];
+}
 
 /**
  * getLastPhoneNumber()
@@ -103,7 +113,9 @@ function getFirstPhoneNumber(person) {}
  *  getLastPhoneNumber(person);
  *  //> 7185558611
  */
-function getLastPhoneNumber(person) {}
+function getLastPhoneNumber(person) {
+  return person.numbers[person.numbers.length - 1];
+}
 
 /**
  * getFullName()
@@ -116,7 +128,9 @@ function getLastPhoneNumber(person) {}
  *  getFullName(person);
  *  //> "Rachel Eleanor Rojas"
  */
-function getFullName(person) {}
+function getFullName(person) {
+  return `${person.names.first} ${person.names.middle} ${person.names.last}`;
+}
 
 /**
  * getCityAndState()
@@ -132,7 +146,9 @@ function getFullName(person) {}
  *  getCityAndState(person);
  *  //> "Staten Island, NY"
  */
-function getCityAndState(person) {}
+function getCityAndState(person) {
+  return `${person.address.city}, ${person.address.state}`;
+}
 
 /**
  * getFullAddress()
@@ -148,7 +164,9 @@ function getCityAndState(person) {}
  *  getFullAddress(person);
  *  //> "697 Pine Drive 2A, Staten Island, NY, 10306"
  */
-function getFullAddress(person) {}
+function getFullAddress(person) {
+  return `${person.address.street} ${person.address.unit}, ${person.address.city}, ${person.address.state}, ${person.address.zip}`;
+}
 
 /**
  * getFlatObject()
@@ -171,7 +189,12 @@ function getFullAddress(person) {}
       numbers: [7185550921, 7185558611],
     };
  */
-function getFlatObject(person) {}
+function getFlatObject(person) {
+  let newObject = {};
+  newObject = Object.assign(person.names, person.address);
+  newObject.numbers = person.numbers;
+  return newObject;
+}
 
 // Do not change the code below.
 module.exports = {
diff --git a/src/09-word-problems.js b/src/09-word-problems.js
index 2f63d723..61efb2e4 100644
--- a/src/09-word-problems.js
+++ b/src/09-word-problems.js
@@ -19,7 +19,19 @@
  *  applyDiscount(1000, 9, true);
  *  //> 700
  */
-function applyDiscount(priceInCents, age, hasMembership) {}
+function applyDiscount(priceInCents, age, hasMembership) {
+  if (hasMembership) {
+    if (age <= 10 || age >= 65) {
+      return priceInCents * 0.70;
+    } else {
+      return priceInCents * 0.80;
+    }
+  } else if (age <= 10 || age >= 65) {
+    return priceInCents * 0.90;
+  } else {
+    return priceInCents;
+  }
+}
 
 /**
  * getCartTotal()
@@ -40,7 +52,14 @@ function applyDiscount(priceInCents, age, hasMembership) {}
     getCartTotal(cart);
  *  //> "$30.00"
  */
-function getCartTotal(products) {}
+function getCartTotal(products) {
+  let total = 0;
+  for (let i = 0; i < products.length; i++) {
+    price = products[i].priceInCents * 0.01 * products[i].quantity;
+    total += price;
+  };
+  return `$${total.toFixed(2)}`;
+}
 
 /**
  * compareLocations()
@@ -80,7 +99,21 @@ function getCartTotal(products) {}
     compareLocations(address1, address2);
     //> "Same city."
  */
-function compareLocations(address1, address2) {}
+function compareLocations(address1, address2) {
+  if (address1.state === address2.state) {
+    if (address1.city === address2.city) {
+      if (address1.street === address2.street) {
+        return "Same building.";
+      } else {
+        return "Same city.";
+      }
+    } else {
+      return "Same state."
+    }
+  } else {
+    return "Addresses are not near each other."
+  }
+}
 
 /**
  * gradeAssignments()
@@ -127,7 +160,27 @@ function compareLocations(address1, address2) {}
     //>   },
     //> ];
  */
-function gradeAssignments(assignments) {}
+function gradeAssignments(assignments) {
+  for (i = 0; i < assignments.length; i++) {
+    if (assignments[i].kind === "PERCENTAGE") {
+      let score = assignments[i].score.received / assignments[i].score.max * 100;
+      if (score >= 80) { 
+        assignments[i]['status'] = `PASSED: ${score.toFixed(1)}%`;
+      } else {
+        assignments[i]['status'] = `FAILED: ${score.toFixed(1)}%`;
+      }
+    } else if (assignments[i].kind === "PASS-FAIL") {
+      if (assignments[i].score.received === assignments[i].score.max) {
+        assignments[i]['status'] = `PASSED`;
+      } else {
+        assignments[i]['status'] = `FAILED`;
+      }
+    } else if (assignments[i].kind === "ESSAY") {
+        assignments[i]['status'] = `SCORE: ${assignments[i].score.received}/${assignments[i].score.max}`;
+    }
+  }
+  return assignments;
+}
 
 /**
  * createLineOrder()
@@ -152,7 +205,19 @@ function gradeAssignments(assignments) {}
     createLineOrder(people);
     //> [ "Ray Anderson", "America Marsh", "Wade Carson", "Patience Patel" ]
  */
-function createLineOrder(people) {}
+function createLineOrder(people) {
+  let arr = [];
+  let arr2 = [];
+  for (let i = 0; i < people.length; i++) {
+    if (people[i].hasMembership) {
+      arr.push(people[i].name);
+    } else {
+     arr2.push(people[i].name);
+    }
+  }
+  let array = arr.concat(arr2);
+  return array;
+}
 
 module.exports = {
   applyDiscount,