diff --git a/assignments/array-methods.js b/assignments/array-methods.js
index f3862361e..80fa4232c 100644
--- a/assignments/array-methods.js
+++ b/assignments/array-methods.js
@@ -58,21 +58,39 @@ const runners = [
 // ==== Challenge 1: Use .forEach() ====
 // The event director needs both the first and last names of each runner for their running bibs. Combine both the first and last names and populate a new array called `fullNames`. This array will contain just strings.
 let fullNames = [];
+
+runners.forEach(runner => {
+  fullNames.push(`${runner.first_name} ${runner.last_name}`);
+});
+
 console.log(fullNames);
 
 // ==== Challenge 2: Use .map() ====
 // The event director needs to have all the runners' first names in uppercase because the director BECAME DRUNK WITH POWER. Populate an array called `firstNamesAllCaps`. This array will contain just strings.
 let firstNamesAllCaps = [];
+
+runners.map((runners, index) => {
+  firstNamesAllCaps[index] = runners.first_name.toUpperCase();
+});
+
 console.log(firstNamesAllCaps);
 
 // ==== Challenge 3: Use .filter() ====
 // The large shirts won't be available for the event due to an ordering issue. We need a filtered version of the runners array, containing only those runners with large sized shirts so they can choose a different size. This will be an array of objects.
 let runnersLargeSizeShirt = [];
+
+runnersLargeSizeShirt = runners.filter(runners => runners.shirt_size === 'L'); 
+  
 console.log(runnersLargeSizeShirt);
 
 // ==== Challenge 4: Use .reduce() ====
 // The donations need to be tallied up and reported for tax purposes. Add up all the donations and save the total into a ticketPriceTotal variable.
-let ticketPriceTotal = 0;
+let ticketPriceTotal = [];
+
+ticketPriceTotal = runners.reduce((totalValue, runners) => {
+  return totalValue + runners.donation;
+}, 0);
+
 console.log(ticketPriceTotal);
 
 // ==== Challenge 5: Be Creative ====
diff --git a/assignments/callbacks.js b/assignments/callbacks.js
index cb72e70c9..bc9e22179 100644
--- a/assignments/callbacks.js
+++ b/assignments/callbacks.js
@@ -39,26 +39,60 @@ const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum'];
 */
 
 
-function getLength(arr, cb) {
+//function getLength(arr, cb) {
   // getLength passes the length of the array into the callback.
-}
-
-function last(arr, cb) {
+const getLength = (arr, cb) => {
+  cb(arr.length);
+};
+  getLength(items, length => {
+    console.log(`The length of the array is ${length}.`);
+  });
+
+const last = (arr, cb) => {
   // last passes the last item of the array into the callback.
+  cb(arr[arr.length -1])
 }
 
+last(items, lastItem => {
+  console.log(`The last item in the array is ${lastItem}`);
+});
+
 function sumNums(x, y, cb) {
   // sumNums adds two numbers (x, y) and passes the result to the callback.
+  return cb(x + y);
 }
 
+sumNums(3, 5, function(sumNums){
+  console.log(sumNums);
+})
+
 function multiplyNums(x, y, cb) {
   // multiplyNums multiplies two numbers and passes the result to the callback.
+  return cb(x * y);
 }
 
+multiplyNums(6, 7, function(multiplyNums){
+  console.log(multiplyNums);
+})
+
 function contains(item, list, cb) {
   // contains checks if an item is present inside of the given array/list.
   // Pass true to the callback if it is, otherwise pass false.
+  if(list.includes(item)){
+    return cb(true);
+  }
+    return cb(false);
+  contains(3,[1,2,3],function(success){
+    if(success){
+    return "true"
+  }
+    return "false"
+  })
 }
+contains('Notebook', items, function(contains){
+  console.log(contains);
+})
+
 
 /* STRETCH PROBLEM */
 
diff --git a/assignments/closure.js b/assignments/closure.js
index 4b399c098..9b3f237e1 100644
--- a/assignments/closure.js
+++ b/assignments/closure.js
@@ -4,6 +4,19 @@
 // that manipulates variables defined in the outer scope.
 // The outer scope can be a parent function, or the top level of the script.
 
+const dogs = () => {
+  let dogNumber = 0;
+  return function() {
+    dogNumber = dogNumber + 1;
+    return dogNumber;
+  }
+};
+
+const moreDogs = dogs();
+console.log(moreDogs());
+console.log(moreDogs());
+console.log(moreDogs());
+console.log(moreDogs());
 
 /* STRETCH PROBLEMS, Do not attempt until you have completed all previous tasks for today's project files */