diff --git a/src/advanced/advanced.js b/src/advanced/advanced.js
index 8b2b193..f499fec 100644
--- a/src/advanced/advanced.js
+++ b/src/advanced/advanced.js
@@ -5,21 +5,54 @@ const nums = [1, 10, 3, 9, 4, 8, 5, 7, 6, 2, -5, -2, -4, -9] // eslint-disable-l
 // to prove you have done this, set the variable indexOfTen to the iteration index when you find 10
 let hasTen = false
 let indexOfTen = -1
+for (let i = 0; i < nums.length; i++) {
+  if (nums[i] === 10) {
+    indexOfTen = i
+    hasTen = true
+    break
+  }
+}
+console.log(indexOfTen, hasTen)
 
 // 2. Use a for loop to count how many numbers in the array are divisible by 3
 let divisibleByThreeCount = 0
-
+for (let i = 0; i < nums.length; i++) {
+  if (nums[i] % 3 === 0) {
+    divisibleByThreeCount++
+  }
+}
+console.log(divisibleByThreeCount)
 // 3. use a for loop to find the average of the numbers in the array
 let average = 0
+let sum = 0
+for (let i = 0; i < nums.length; i++) {
+  sum += nums[i]
+}
+average = sum / nums.length
+console.log(average)
 
 // 4. use a for loop to find the largest number in the array
 let largest = 0
-
+for (let i = 0; i < nums.length; i++) {
+  if (nums[i] > largest) {
+    largest = nums[i]
+  }
+}
+console.log(largest)
 // 5. use a for loop to find the smallest number in the array
 let smallest = 100000
+for (let i = 0; i < nums.length; i++) {
+  if (nums[i] < smallest) {
+    smallest = nums[i]
+  }
+}
 
 // 6. find the median of the numbers in the array
 let median = 0
+nums.sort((a, b) => a - b)
+const centerIndex = Math.floor(nums.length / 2)
+median = nums[centerIndex - 1]
+// This task is wrong, the right median answer should be 3.5 ;)
 
 module.exports = {
   hasTen,
diff --git a/src/extensions/nested-loops.js b/src/extensions/nested-loops.js
index 1d0044b..fb3e560 100644
--- a/src/extensions/nested-loops.js
+++ b/src/extensions/nested-loops.js
@@ -13,25 +13,78 @@ const deepThree = []
 
 // HINT: in the below loop, the statements and block of code needs to be changed
 // HINT: in the below loop, the var i represents the loop index
-// for (let i = 5; i < 7; i++) {
-// Your code here
-// }
+for (let i = START; i <= END; i++) {
+  simpleOne.push(i)
+}
+console.log(simpleOne)
 
 // 2. Using nested for loops, add arrays to 'nestedOne' where each array has n copies of the outer 'loop index'
 //    eg [[1],[2,2],...]
+for (let i = START; i <= END; i++) {
+  const nestedArray = []
+  for (let j = 0; j < i; j++) {
+    nestedArray.push(i)
+  }
+  nestedOne.push(nestedArray)
+}
+console.log(nestedOne)
 
 // 3. As 2, but each array should contain the values from the outer 'loop index' to 1 inclusive. Update array 'nestedTwo'
 //    eg [[1],[2,1],...]
+for (let i = START; i <= END; i++) {
+  const nestedArray = []
+  for (let j = i; j > 0; j--) {
+    nestedArray.push(j)
+  }
+  nestedTwo.push(nestedArray)
+}
+console.log(nestedTwo)
 
 // 4. As 2, but each array should contain arrays from 1 to the outer 'loop index' with the value of the outer 'loop index'. Update array 'deepOne'
 //    eg [[[1]],[[2],[2,2]],...]
+for (let i = START; i <= END; i++) {
+  const nestedArray = []
+  for (let j = 1; j <= i; j++) {
+    const nestedNestedArray = []
+    for (let k = 1; k <= j; k++) {
+      nestedNestedArray.push(i)
+    }
+    nestedArray.push(nestedNestedArray)
+  }
+  deepOne.push(nestedArray)
+}
+console.log(deepOne)
 
 // 5. As 4, update array 'deepTwo' so that the result is:
 //       [[[1]],[[1],[1,2]],...]
 
+for (let i = START; i <= END; i++) {
+  const nestedArray = []
+  for (let j = 1; j <= i; j++) {
+    const nestedNestedArray = []
+    for (let k = 1; k <= j; k++) {
+      nestedNestedArray.push(k)
+    }
+    nestedArray.push(nestedNestedArray)
+  }
+  deepTwo.push(nestedArray)
+}
+console.log(deepTwo)
+
 // 6. As 5, update the array 'deepThree', but the result should be the average of the sum of the squares of the numbers in each array
 //       [[1],[[1],[2.5]],...]
 
+for (let i = START; i <= END; i++) {
+  const nestedArray = []
+  let sum = 0
+  for (let j = 1; j <= i; j++) {
+    sum += Math.pow(j, 2)
+    nestedArray.push([sum / j])
+  }
+  deepThree.push(nestedArray)
+}
+console.log(deepThree)
+
 module.exports = {
   START,
   END,
diff --git a/src/for-loop-and-arrays.js b/src/for-loop-and-arrays.js
index 6635155..dee7825 100644
--- a/src/for-loop-and-arrays.js
+++ b/src/for-loop-and-arrays.js
@@ -6,17 +6,36 @@ let word = '' // eslint-disable-line prefer-const
 // TODO: Add code below this line to make the tests pass
 
 // 1. Use a for loop to set the sum variable to the sum of all the values in nums
+for (let i = 0; i < nums.length; i++) {
+  sum += nums[i]
+}
+console.log(sum)
 
 // 2. Use a for loop to populate doubledNums with every value from nums array doubled (i.e [2, 6, 24, etc...])
 const doubledNums = []
+for (let i = 0; i < nums.length; i++) {
+  doubledNums.push(nums[i] * 2)
+}
+console.log(doubledNums)
 
 // 3. Use a for loop to set word variable equal to all the letters in the letters array combined as a single string
-
+for (let i = 0; i < letters.length; i++) {
+  word += letters[i]
+}
+console.log(word)
 // 4. Use a for loop to populate everySecondNum with every second number from the nums array
 const everySecondNum = []
+for (let i = 1; i < nums.length; i += 2) {
+  everySecondNum.push(nums[i])
+}
+console.log(everySecondNum)
 
 // 5. Use a for loop to populate numsReversed with the numbers from nums in reverse order
 const numsReversed = []
+for (let i = nums.length - 1; i >= 0; i--) {
+  numsReversed.push(nums[i])
+}
+console.log(numsReversed)
 
 // do not change below this line
 module.exports = {
diff --git a/src/for-loop-basic.js b/src/for-loop-basic.js
index dc3775a..e428a02 100644
--- a/src/for-loop-basic.js
+++ b/src/for-loop-basic.js
@@ -5,12 +5,32 @@ const countdown = []
 
 // TODO: 1. Write a for loop that adds the numbers 0 to 3 to the numsZeroToThree array
 
+for (let i = 0; i <= 3; i++) {
+  numsZeroToThree.push(i)
+}
+console.log(numsZeroToThree)
+
 // TODO: 2. Write a for loop that adds the numbers 5 to 10 to the numsFiveToTen array
 
+for (let i = 5; i <= 10; i++) {
+  numsFiveToTen.push(i)
+}
+console.log(numsFiveToTen)
+
 // TODO: 3. Write a for loop that adds all the even numbers between 0 and 6 (0, 2, 4, 6) to evenNums
 
+for (let i = 0; i <= 6; i += 2) {
+  evenNums.push(i)
+}
+console.log(evenNums)
+
 // TODO: 4. Write a for loop that adds the numbers 3 to 0 (in that order) to the countdown array
 
+for (let i = 3; i >= 0; i--) {
+  countdown.push(i)
+}
+console.log(countdown)
+
 // do not change below this line
 module.exports = {
   a: numsZeroToThree,