diff --git a/README.md b/README.md
index 408612117c..b69aaff4e3 100644
--- a/README.md
+++ b/README.md
@@ -1,59 +1,47 @@
-# Sprint Challenge: JavaScript Fundamentals
-
-This challenge allows you to practice the concepts and techniques learned over the past week and apply them in a survey of problems. This Sprint explored JavaScript Fundamentals. During this Sprint, you studied variables, functions, object literals, arrays, this keyword, prototypes, and class syntax. In your challenge this week, you will demonstrate proficiency by completing a survey of JavaScript problems.
-
-## Instructions
-
-**Read these instructions carefully. Understand exactly what is expected _before_ starting this Sprint Challenge.**
-
-This is an individual assessment. All work must be your own. Your challenge score is a measure of your ability to work independently using the material covered through this sprint. You need to demonstrate proficiency in the concepts and objectives introduced and practiced in preceding days.
-
-You are not allowed to collaborate during the Sprint Challenge. However, you are encouraged to follow the twenty-minute rule and seek support from your TL and Instructor in your cohort help channel on Slack. Your work reflects your proficiency in JavaScript fundamentals.
-
-You have three hours to complete this challenge. Plan your time accordingly.
-
-## Commits
-
-Commit your code regularly and meaningfully. This helps both you (in case you ever need to return to old code for any number of reasons) and your team lead.
-
-## Description
-
-You will notice there are several JavaScript files being brought into the index.html file.  Each of those files contain JavaScript problems you need to solve.  If you get stuck on something, skip over it and come back to it later.
-
-In meeting the minimum viable product (MVP) specifications listed below, you should have a console full of correct responses to the problems given.
-
-## Self-Study Questions
-
-Demonstrate your understanding of this week's concepts by answering the following free-form questions.
-
-Edit this document to include your answers after each question. Make sure to leave a blank line above and below your answer so it is clear and easy to read by your team lead
-
 1. Describe the biggest difference between `.forEach` & `.map`.
+.foreach goes through each element in an array, and allows you to manipulate data for each of the items inside of the array.
+.map creates a new array depending on what you pass into it, for example you can get all the emails from objects without writing a foreach loop.
 
 2. What is the difference between a function and a method?
+A method is a function inside of an object, they are similar but a function doesn't have to be inside an object.
 
 3. What is closure?
+Its how you give access to an outer function's scope from an inner function
 
 4. Describe the four rules of the 'this' keyword.
+Window/Global
+Any variable that's not inside any function or black is inside the global scope
+
+New
+Constructs object based on the function/instance called
+
+Implicit
+When a method inside an object is called
+
+Explicit
+When you use .apply(), .call(), .bind() or inbuilt functions to manipulate data of an object
+
 
 5. Why do we need super() in an extended class?
+Properly access data in the parent class that it is inheriting
+
 
 ## Project Set up
 
 Follow these steps to set up and work on your project:
 
-- [ ] Create a forked copy of this project.
-- [ ] Add TL as collaborator on Github.
-- [ ] Clone your OWN version of Repo (Not Lambda's by mistake!).
-- [ ] Create a new Branch on the clone: git checkout -b `<firstName-lastName>`.
-- [ ] Create a pull request before you start working on the project requirements.  You will continuously push your updates throughout the project.
-- [ ] You are now ready to build this project with your preferred IDE
-- [ ] Implement the project on your Branch, committing changes regularly.
-- [ ] Push commits: git push origin `<firstName-lastName>`.
+- [x] Create a forked copy of this project.
+- [x] Add TL as collaborator on Github.
+- [x] Clone your OWN version of Repo (Not Lambda's by mistake!).
+- [x] Create a new Branch on the clone: git checkout -b `<firstName-lastName>`.
+- [x] Create a pull request before you start working on the project requirements.  You will continuously push your updates throughout the project.
+- [x] You are now ready to build this project with your preferred IDE
+- [x] Implement the project on your Branch, committing changes regularly.
+- [x] Push commits: git push origin `<firstName-lastName>`.
 
 Follow these steps for completing your project:
 
-- [ ] Submit a Pull-Request to merge <firstName-lastName> Branch into master (student's  Repo).
+- [x] Submit a Pull-Request to merge <firstName-lastName> Branch into master (student's  Repo).
 - [ ] Add your team lead as a Reviewer on the Pull-request
 - [ ] TL then will count the HW as done by  merging the branch back into master.
 
@@ -66,19 +54,19 @@ Your finished project must include all of the following requirements:
 
 ## Task 1: Objects and Arrays
 Test your knowledge of objects and arrays. 
-* [ ] Use the [objects-arrays.js](challenges/objects-arrays.js) link to get started.  Read the instructions carefully!
+* [x] Use the [objects-arrays.js](challenges/objects-arrays.js) link to get started.  Read the instructions carefully!
 
 ## Task 2: Functions
 This challenge takes a look at callbacks and closures as well as scope. 
-* [ ] Use the [functions.js](challenges/functions.js) link to get started. Read the instructions carefully!
+* [x] Use the [functions.js](challenges/functions.js) link to get started. Read the instructions carefully!
 
 ## Task 3: Prototypes
 Create constructors, bind methods, and create cuboids in this prototypes challenge.
-* [ ] Use the [prototypes.js](challenges/prototypes.js) link to get started. Read the instructions carefully!
+* [x] Use the [prototypes.js](challenges/prototypes.js) link to get started. Read the instructions carefully!
 
 ## Task 4: Classes
 Once you have completed the prototypes challenge, it's time to convert all your hard work into classes.
-* [ ] Use the [classes.js](challenges/classes.js) link to get started. Read the instructions carefully!
+* [x] Use the [classes.js](challenges/classes.js) link to get started. Read the instructions carefully!
 
 In your solutions, it is essential that you follow best practices and produce clean and professional results. Schedule time to review, refine, and assess your work and perform basic professional polishing including spell-checking and grammar-checking on your work. It is better to submit a challenge that meets MVP than one that attempts too much and does not.
 
diff --git a/challenges/classes.js b/challenges/classes.js
index 992e39dc0b..fe52f3e5f4 100644
--- a/challenges/classes.js
+++ b/challenges/classes.js
@@ -1,7 +1,46 @@
 // 1. Copy and paste your prototype in here and refactor into class syntax.
 
+class CuboidMaker {
+	constructor(properties){			
+		this.length = properties.length;
+		this.width = properties.width;
+		this.height = properties.height;
+	}
+
+	volume() {
+		return this.length * this.width * this.height;
+	}
+
+	surfaceArea() {
+		return 2 * (this.length * this.width + this.length * this.height + this.width * this.height);
+	}
+}
+
+const cuboid = new CuboidMaker ({
+	length: 4,
+	width: 5,
+	height: 5
+});
+
 // Test your volume and surfaceArea methods by uncommenting the logs below:
-// console.log(cuboid.volume()); // 100
-// console.log(cuboid.surfaceArea()); // 130
+console.log(cuboid.volume()); // 100
+console.log(cuboid.surfaceArea()); // 130
+
+/* Stretch Task: Extend the base class CuboidMaker with a sub class called CubeMaker.  
+Find out the formulas for volume and surface area for cubes and create those methods using the dimension properties from CuboidMaker.  
+Test your work by logging out your volume and surface area. */
+
+class CubeMaker extends CuboidMaker {
+	constructor(attributes){
+		super(attributes);
+	}
+}
+
+const cube = new CubeMaker ({
+	length: 2.5,
+	width: 2.5,
+	height: 2.5
+})
 
-// Stretch Task: Extend the base class CuboidMaker with a sub class called CubeMaker.  Find out the formulas for volume and surface area for cubes and create those methods using the dimension properties from CuboidMaker.  Test your work by logging out your volume and surface area.
\ No newline at end of file
+console.log(cube.volume()); //15.625
+console.log(cube.surfaceArea()); //37.5
diff --git a/challenges/functions.js b/challenges/functions.js
index 6e3688bfcc..a0a5c4b50d 100644
--- a/challenges/functions.js
+++ b/challenges/functions.js
@@ -6,6 +6,9 @@
   * The last parameter accepts a callback
   * The consume function should return the invocation of cb, passing a and b into cb as arguments
 */
+function consume(a, b, cb){
+  return cb(a, b);
+}
 
 
 /* Step 2: Create several functions to callback with consume();
@@ -13,19 +16,30 @@
   * Create a function named multiply that returns the product of two numbers 
   * Create a function named greeting that accepts a first and last name and returns "Hello first-name last-name, nice to meet you!"
 */
+function add(num1, num2){
+  return num1 + num2;
+}
+
+function multiply(num1, num2){
+  return num1 * num2;
+}
+
+function greeting(first, last){
+  return `Hello ${first} ${last}, nice to meet you!`;
+}
 
 
 /* Step 3: Check your work by un-commenting the following calls to consume(): */
-// console.log(consume(2, 2, add)); // 4
-// console.log(consume(10, 16, multiply)); // 160
-// console.log(consume("Mary", "Poppins", greeting)); // Hello Mary Poppins, nice to meet you!
+ console.log(consume(2, 2, add)); // 4
+ console.log(consume(10, 16, multiply)); // 160
+ console.log(consume("Mary", "Poppins", greeting)); // Hello Mary Poppins, nice to meet you!
 
 
 // ==== Closures ==== 
 
 // Explain in your own words why nestedfunction can access the variable internal.
 
-// Explanation: 
+// External is on the global scope, so everything can access it. Internal is a parent scope of the nestedFunction, so nestedFunction can access its variable.
 
 
 const external = "I'm outside the function";
diff --git a/challenges/objects-arrays.js b/challenges/objects-arrays.js
index 659e3e149c..cabb9a5c36 100644
--- a/challenges/objects-arrays.js
+++ b/challenges/objects-arrays.js
@@ -7,28 +7,52 @@
 */
 
 // tyrannosaurus, carnivorous, 7000kg, 12m, Late Cretaceous
+const tyrannosaurus = {
+  name: 'tyrannosaurus',
+  diet: 'carnivorous',
+  weight: '7000kg',
+  length: '12m',
+  period: "Late Cretaceous",
+  roar(){
+    return "RAWERSRARARWERSARARARRRR";
+  }
+}
+
 
 // stegosaurus, herbivorous, 2000kg, 9m, Late Jurassic
+const stegosaurus = {
+  name: 'stegosaurus',
+  diet: 'herbivorous',
+  weight: '2000kg',
+  length: '9m',
+  period: "Late Jurassic"
+}
 
 // velociraptor, carnivorous, 15kg, 1.8m, Late Cretaceous
+const velociraptor = {
+  name: 'velociraptor',
+  diet: 'carnivorous',
+  weight: '15kg',
+  length: '1.8m',
+  period: "Late Cretaceous"
+}
 
 // Using your dinosaur objects, log answers to these questions:
 
 // How much did tyrannosaurus weigh?
-console.log();
+console.log(tyrannosaurus.weight);
 
 // What was the diet of a velociraptor?
-console.log();
+console.log(velociraptor.diet);
 
 // How long was a stegosaurus?
-console.log();
+console.log(stegosaurus.length);
 
 // What time period did tyrannosaurus live in?
-console.log();
-
+console.log(tyrannosaurus.period);
 
 // Create a new roar method for the tyrannosaurus.  When called, return "RAWERSRARARWERSARARARRRR!" Log the result.
-console.log();
+console.log(tyrannosaurus.roar());
 
 
 // ==== Arrays ====
@@ -43,7 +67,7 @@ const graduates = [
   { id: 5, first_name: "Chick", university: "Sultan Salahuddin Abdul Aziz Shah Polytechnic", email: "camorts4@google.com.au" },
   { id: 6, first_name: "Jakob", university: "Fachhochschule Rosenheim, Hochschule für Technik und Wirtschaft", email: "jharken5@spiegel.de" },
   { id: 7, first_name: "Robbi", university: "Salem University", email: "rbrister6@redcross.org" },
-  { id: 8, first_name: "Colline", university: "Coastal Carolina University", email: "cbrosh7@alibaba.com" },
+  { id: 8, first_name: "Colline", university: "Coastal Carolina University", email: "cbrosh7@alibaba.com" },  
   { id: 9, first_name: "Michail", university: "Universidad Católica de Ávila", email: "mrome8@shinystat.com" },
   { id: 10, first_name: "Hube", university: "Universitat Rovira I Virgili Tarragona", email: "hlethbrig9@foxnews.com" },
 ];
@@ -52,6 +76,7 @@ const graduates = [
 
 Once you have the new array created, sort the universities alphabetically and log the result. */
 const universities = [];
+graduates.forEach(element => universities.push(element.university));
 console.log(universities);
 
 /* Request 2: Create a new array called contactInfo that contains both first name and email of each student. This will be an array of strings.
@@ -61,10 +86,20 @@ The resulting contact information strings should have a space between the first
 
 Log the result of your new array. */
 const contactInfo = [];
+graduates.forEach(student => contactInfo.push(`${student.first_name} ${student.email}`));
 console.log(contactInfo);
 
 /* Request 3: Find out how many universities have the string "Uni" included in their name. Create a new array called unisWithUni that contains them all. This will be an array of objects. Log the result. */
 const unisWithUni = [];
+
+for(let i=0; i < universities.length; i++){
+  let university = universities[i];
+  if(university.includes("Uni"))
+  {
+    unisWithUni.push(university);
+  }
+}
+
 console.log(unisWithUni);
 
 
@@ -86,36 +121,45 @@ const zooAnimals = [
 ];
 
 /* Request 1: .forEach()
-
-The zoos want to display both the scientific name and the animal name in front of the habitats. Populate the displayNames array with only the animal_name and scientific_name of each animal. displayNames will be an array of strings, and each string should follow this pattern: "Name: Jackal, asiatic, Scientific: Canis aureus."
-
+The zoos want to display both the scientific name and the animal name in front of the habitats. 
+Populate the displayNames array with only the animal_name and scientific_name of each animal. 
+isplayNames will be an array of strings, and each string should follow this pattern: 
+"Name: Jackal, asiatic, Scientific: Canis aureus."
 */
 const displayNames = [];
+zooAnimals.forEach(animal => displayNames.push(`Name: ${animal.animal_name}, Scientific: ${animal.scientific_name}`));
 console.log(displayNames);
 
 /* Request 2: .map()
-
-The zoos need a list of all their animal's names (animal_name only) converted to lower case. Using map, create a new array of strings named lowCaseAnimalNames, each string following this pattern: "jackal, asiatic". Log the resut.
-
+The zoos need a list of all their animal's names (animal_name only) converted to lower case. 
+Using map, create a new array of strings named lowCaseAnimalNames, each string following this pattern: 
+"jackal, asiatic". Log the resut.
 */
 
 const lowCaseAnimalNames = [];
+zooAnimals.map(animal => lowCaseAnimalNames.push(animal.animal_name.toLowerCase()));
 console.log(lowCaseAnimalNames);
 
 /* Request 3: .filter() 
 
-The zoos are concerned about animals with a lower population count. Using filter, create a new array of objects called lowPopulationAnimals which contains only the animals with a population less than 5.
+The zoos are concerned about animals with a lower population count. 
+Using filter, create a new array of objects called lowPopulationAnimals which contains only the animals with a population less than 5.
 
 */
 const lowPopulationAnimals = [];
+lowPopulationAnimals.push(zooAnimals.filter(animal => animal.population < 5));
 console.log(lowPopulationAnimals);
 
 /* Request 4: .reduce() 
 
-The zoos need to know their total animal population across the United States. Find the total population from all the zoos using the .reduce() method. Remember the reduce method takes two arguments: a callback (which itself takes two args), and an initial value for the count.
+The zoos need to know their total animal population across the United States. 
+Find the total population from all the zoos using the .reduce() method. 
+Remember the reduce method takes two arguments: a callback (which itself takes two args), and an initial value for the count.
 
 */
-const populationTotal = 0;
+const populationTotal = zooAnimals.reduce(function(accumulator, cb){
+  return accumulator + cb.population;
+}, 0);
 console.log(populationTotal);
 
 
diff --git a/challenges/prototypes.js b/challenges/prototypes.js
index 4cafc33e95..e112e5f781 100644
--- a/challenges/prototypes.js
+++ b/challenges/prototypes.js
@@ -5,6 +5,11 @@
 /* == Step 1: Base Constructor ==
   Create a constructor function named CuboidMaker that accepts properties for length, width, and height
 */
+function CuboidMaker(properties){
+	this.length = properties.length;
+	this.width = properties.width;
+	this.height = properties.height;
+}
 
 
 /* == Step 2: Volume Method ==
@@ -12,6 +17,9 @@
   
   Formula for cuboid volume: length * width * height
 */
+CuboidMaker.prototype.volume = function () {
+	return this.length * this.height * this.width;
+}
 
 
 /* == Step 3: Surface Area Method ==
@@ -19,15 +27,23 @@
 
   Formula for cuboid surface area of a cube: 2 * (length * width + length * height + width * height)
 */
+CuboidMaker.prototype.surfaceArea = function () {
+	return 2 * (this.length * this.width + this.length * this.height + this.width * this.height);
+}
 
 
 /* == Step 4: Create a new object that uses CuboidMaker ==
   Create a cuboid object that uses the new keyword to use our CuboidMaker constructor
   Add properties and values of length: 4, width: 5, and height: 5 to cuboid.   
 */
+const cuboid = new CuboidMaker ({
+	length: 4,
+	width: 5,
+	height: 5
+});
 
 // Test your volume and surfaceArea methods by uncommenting the logs below:
-// console.log(cuboid.volume()); // 100
-// console.log(cuboid.surfaceArea()); // 130
+console.log(cuboid.volume()); // 100
+console.log(cuboid.surfaceArea()); // 130