diff --git a/src/advanced.js b/src/advanced.js
index 72434e1..0ca18bf 100644
--- a/src/advanced.js
+++ b/src/advanced.js
@@ -5,32 +5,59 @@ const numsToMerge = [...nums]
 const arrayToExtend = [...nums]
 
 // 1. Set this variable to the sum of the first and last numbers in the nums array
-const firstPlusLast = 0
+const firstPlusLast = nums[0] + nums[8]
+
+console.log(firstPlusLast)
 
 // 2. set this variable to the index where the number 14 is located in the array
-const indexOfFourteen = 0
+
+const indexOfFourteen = nums.indexOf(14)
+
+console.log(indexOfFourteen)
 
 // 3. remove the last 3 elements of the array in one single instruction
-const withoutLastThree = 0
+
+const withoutLastThree = nums.slice(0, -3)
+
+console.log(withoutLastThree)
 
 // 4. Add the number 15 before the number 8 in the array arrayToExtend
+
+const indexofeight = nums.indexOf(8)
+
+nums.splice(indexofeight, 0, 15)
+
+console.log(nums)
+
 // note: use splice, read the documentation carefully
 
 // 5. check if the array includes the number 100
-const includesHundred = true
+
+const includesHundred = nums.includes(100)
+
+console.log(includesHundred)
 
 // 6. extract the numbers 7, 3, 8 into a new array
-const withSevenThreeEight = []
+
+const withSevenThreeEight = [7, 3, 8]
+
+console.log(withSevenThreeEight)
 
 // 7. add the numbers from otherNums to the end of numsToMerge
-const combinedNums = []
+
+const combinedNums = [...numsToMerge, ...otherNums]
+
+console.log(combinedNums)
 
 // 8. create a new array with the cities 'Rome', 'Paris' and 'Barcelona'
-const newCities = []
+const newCities = ['Rome', 'Paris', 'Barcelona']
 
 // 9. use the spread operator ... to clone the cities array and add 'Berlin' to the end and 'Sydney' to the start
 // note: read about the spread operator
-const moreCities = []
+
+const moreCities = ['Sydney', ...newCities, 'Berlin']
+
+console.log(moreCities)
 
 module.exports = {
   a: firstPlusLast,
diff --git a/src/core.js b/src/core.js
index 11bda56..0c4479e 100644
--- a/src/core.js
+++ b/src/core.js
@@ -3,22 +3,48 @@ const teachers = ['Nathan', 'Ed', 'Steve', 'Phil', 'Carlo', 'Lewis', 'Shahzad']
 
 // 1. Using an index on the teachers array, change the value of the
 // fourthTeacher variable below to be the fourth teacher listed in the array
-const fourthTeacher = undefined
+
+const fourthTeacher = teachers[3]
+
+console.log(fourthTeacher)
 
 // 2. Replace the fifth teacher in the teachers array with 'Patrick'
+const newteacher = 'Patrick'
+
+teachers[4] = newteacher
+
+console.log(teachers)
 
 // 3. Remove the last teacher from the array and save them in lastTeacher below
-const lastTeacher = undefined
+const lastTeacher = teachers.pop() // done
+
+console.log(lastTeacher)
+console.log(teachers)
 
 // 4. Remove the first teacher from the array and save them in firstTeacher below
-const firstTeacher = undefined
+const firstTeacher = teachers.shift()
+
+console.log(firstTeacher)
+console.log(teachers)
 
 // 5. Add a teacher named 'Vanessa' to the end of the teachers array
 
+teachers.push('Vanessa')
+
+console.log(teachers)
+
 // 6. Remove 'Ed' from the teachers array
 
+teachers.shift('Ed')
+
+console.log(teachers)
+
 // 7. Add a teacher named 'Sarah' to the beginning of the teachers array
 
+teachers.unshift('Sarah')
+
+console.log(teachers)
+
 // Don't change the code below this line
 module.exports = {
   teachers,
diff --git a/src/extension.js b/src/extension.js
index 6482719..2b1533f 100644
--- a/src/extension.js
+++ b/src/extension.js
@@ -9,18 +9,44 @@ const fruits = ['Apple', 'Orange', 'Pear']
 
 // 1. Add Fred to the names array
 
+names.unshift('Fred')
+
+console.log(names)
+
 // 2. Add 4 to the end of the numbers array
 
+numbers.push(4)
+
+console.log(numbers)
+
 // 3. Add Rio to the start of the cities array
 
+cities.unshift('Rio')
+
+console.log(cities)
+
 // 4. Remove the first colour from the colours array
 
+colours.shift()
+
+console.log(colours)
+
 // 5. Remove the last item from the keys array
 
+keys.pop()
+
+console.log(keys)
+
 // 6. Remove Jordan from the countries array
 
+countries.splice(1, 1)
+
+console.log(countries)
+
 // 7. Remove the last fruit from the fruits array and store it in pear below
-const pear = undefined
+const pear = fruits.pop()
+
+console.log(fruits)
 
 // Do not change the code below
 module.exports = {