diff --git a/03_reverseString/reverseString.js b/03_reverseString/reverseString.js
index f6790f0..d2cb276 100644
--- a/03_reverseString/reverseString.js
+++ b/03_reverseString/reverseString.js
@@ -1,5 +1,9 @@
-const reverseString = function() {
-
+const reverseString = function (str) {
+  let newString = "";
+  for (let i = str.length - 1; i >= 0; i--) {
+    newString += str[i];
+  }
+  return newString;
 };
 
 // Do not edit below this line
diff --git a/03_reverseString/reverseString.spec.js b/03_reverseString/reverseString.spec.js
index 8adb887..0a39e16 100644
--- a/03_reverseString/reverseString.spec.js
+++ b/03_reverseString/reverseString.spec.js
@@ -1,18 +1,18 @@
-const reverseString = require('./reverseString')
+const reverseString = require("./reverseString");
 
-describe('reverseString', () => {
-  test('reverses single word', () => {
-    expect(reverseString('hello')).toEqual('olleh');
+describe("reverseString", () => {
+  test("reverses single word", () => {
+    expect(reverseString("hello")).toEqual("olleh");
   });
 
-  test.skip('reverses multiple words', () => {
-    expect(reverseString('hello there')).toEqual('ereht olleh')
-  })
+  test("reverses multiple words", () => {
+    expect(reverseString("hello there")).toEqual("ereht olleh");
+  });
 
-  test.skip('works with numbers and punctuation', () => {
-    expect(reverseString('123! abc!')).toEqual('!cba !321')
-  })
-  test.skip('works with blank strings', () => {
-    expect(reverseString('')).toEqual('')
-  })
+  test("works with numbers and punctuation", () => {
+    expect(reverseString("123! abc!")).toEqual("!cba !321");
+  });
+  test("works with blank strings", () => {
+    expect(reverseString("")).toEqual("");
+  });
 });
diff --git a/04_removeFromArray/removeFromArray.js b/04_removeFromArray/removeFromArray.js
index 1bedeb0..980cc5a 100644
--- a/04_removeFromArray/removeFromArray.js
+++ b/04_removeFromArray/removeFromArray.js
@@ -1,5 +1,5 @@
-const removeFromArray = function() {
-
+const removeFromArray = function (arr, ...args) {
+  return arr.filter((x) => !args.includes(x));
 };
 
 // Do not edit below this line
diff --git a/04_removeFromArray/removeFromArray.spec.js b/04_removeFromArray/removeFromArray.spec.js
index 21f34cf..ebce2bf 100644
--- a/04_removeFromArray/removeFromArray.spec.js
+++ b/04_removeFromArray/removeFromArray.spec.js
@@ -1,25 +1,25 @@
-const removeFromArray = require('./removeFromArray')
+const removeFromArray = require("./removeFromArray");
 
-describe('removeFromArray', () => {
-  test('removes a single value', () => {
+describe("removeFromArray", () => {
+  test("removes a single value", () => {
     expect(removeFromArray([1, 2, 3, 4], 3)).toEqual([1, 2, 4]);
   });
-  test.skip('removes multiple values', () => {
+  test("removes multiple values", () => {
     expect(removeFromArray([1, 2, 3, 4], 3, 2)).toEqual([1, 4]);
   });
-  test.skip('ignores non present values', () => {
+  test("ignores non present values", () => {
     expect(removeFromArray([1, 2, 3, 4], 7, "tacos")).toEqual([1, 2, 3, 4]);
   });
-  test.skip('ignores non present values, but still works', () => {
+  test("ignores non present values, but still works", () => {
     expect(removeFromArray([1, 2, 3, 4], 7, 2)).toEqual([1, 3, 4]);
   });
-  test.skip('can remove all values', () => {
+  test("can remove all values", () => {
     expect(removeFromArray([1, 2, 3, 4], 1, 2, 3, 4)).toEqual([]);
   });
-  test.skip('works with strings', () => {
+  test("works with strings", () => {
     expect(removeFromArray(["hey", 2, 3, "ho"], "hey", 3)).toEqual([2, "ho"]);
   });
-  test.skip('only removes same type', () => {
+  test("only removes same type", () => {
     expect(removeFromArray([1, 2, 3], "1", 3)).toEqual([1, 2]);
   });
 });
diff --git a/05_sumAll/sumAll.js b/05_sumAll/sumAll.js
index 00880c7..2fb6d7f 100644
--- a/05_sumAll/sumAll.js
+++ b/05_sumAll/sumAll.js
@@ -1,5 +1,23 @@
-const sumAll = function() {
+const sumAll = function (num1, num2) {
+  let sum = 0;
 
+  if (num1 > num2) {
+    for (let i = num2; i <= num1; i++) {
+      sum += i;
+    }
+  } else if (num1 < 0 || num2 < 0) {
+    sum = "ERROR";
+  } else if (typeof num1 != "number" || typeof num2 != "number") {
+    sum = "ERROR";
+  } else if (isNaN(num1) || isNaN(num2)) {
+    sum = "ERROR";
+  } else {
+    for (let i = num1; i <= num2; i++) {
+      sum += i;
+    }
+  }
+
+  return sum;
 };
 
 // Do not edit below this line
diff --git a/05_sumAll/sumAll.spec.js b/05_sumAll/sumAll.spec.js
index 1a9fb7c..91d5a27 100644
--- a/05_sumAll/sumAll.spec.js
+++ b/05_sumAll/sumAll.spec.js
@@ -1,22 +1,22 @@
-const sumAll = require('./sumAll')
+const sumAll = require("./sumAll");
 
-describe('sumAll', () => {
-  test('sums numbers within the range', () => {
+describe("sumAll", () => {
+  test("sums numbers within the range", () => {
     expect(sumAll(1, 4)).toEqual(10);
   });
-  test.skip('works with large numbers', () => {
+  test("works with large numbers", () => {
     expect(sumAll(1, 4000)).toEqual(8002000);
   });
-  test.skip('works with larger number first', () => {
+  test("works with larger number first", () => {
     expect(sumAll(123, 1)).toEqual(7626);
   });
-  test.skip('returns ERROR with negative numbers', () => {
-    expect(sumAll(-10, 4)).toEqual('ERROR');
+  test("returns ERROR with negative numbers", () => {
+    expect(sumAll(-10, 4)).toEqual("ERROR");
   });
-  test.skip('returns ERROR with non-number parameters', () => {
-    expect(sumAll(10, "90")).toEqual('ERROR');
+  test("returns ERROR with non-number parameters", () => {
+    expect(sumAll(10, "90")).toEqual("ERROR");
   });
-  test.skip('returns ERROR with non-number parameters', () => {
-    expect(sumAll(10, [90, 1])).toEqual('ERROR');
+  test("returns ERROR with non-number parameters", () => {
+    expect(sumAll(10, [90, 1])).toEqual("ERROR");
   });
 });