diff --git a/package-lock.json b/package-lock.json
index d218146..fab8ea6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3388,9 +3388,9 @@
       }
     },
     "node_modules/jest-snapshot/node_modules/semver": {
-      "version": "7.3.7",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.7.tgz",
-      "integrity": "sha512-QlYTucUYOews+WeEujDoEGziz4K6c47V/Bd+LjSSYcA94p+DmINdf7ncaUinThfvZyu13lN9OY1XDxt8C0Tw0g==",
+      "version": "7.5.4",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
+      "integrity": "sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==",
       "dev": true,
       "dependencies": {
         "lru-cache": "^6.0.0"
@@ -3781,9 +3781,9 @@
       "dev": true
     },
     "node_modules/json5": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.1.tgz",
-      "integrity": "sha512-1hqLFMSrGHRHxav9q9gNjJ5EXznIxGVO09xQRrwplcS8qs28pZ8s8hupZAmqDwZUmVZ2Qb2jnyPOWcDH8m8dlA==",
+      "version": "2.2.3",
+      "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.3.tgz",
+      "integrity": "sha512-XmOWe7eyHYH14cLdVPoyg+GOH3rYX++KpzrylJwSW98t3Nk+U8XOl8FWKOgwtzdb8lXGf6zYwDUzeHMWfxasyg==",
       "dev": true,
       "bin": {
         "json5": "lib/cli.js"
@@ -4250,9 +4250,9 @@
       "dev": true
     },
     "node_modules/semver": {
-      "version": "6.3.0",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
-      "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
       "dev": true,
       "bin": {
         "semver": "bin/semver.js"
@@ -4555,9 +4555,9 @@
       }
     },
     "node_modules/ts-jest/node_modules/semver": {
-      "version": "7.3.7",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.7.tgz",
-      "integrity": "sha512-QlYTucUYOews+WeEujDoEGziz4K6c47V/Bd+LjSSYcA94p+DmINdf7ncaUinThfvZyu13lN9OY1XDxt8C0Tw0g==",
+      "version": "7.5.4",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
+      "integrity": "sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==",
       "dev": true,
       "dependencies": {
         "lru-cache": "^6.0.0"
@@ -7463,9 +7463,9 @@
           "dev": true
         },
         "semver": {
-          "version": "7.3.7",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.7.tgz",
-          "integrity": "sha512-QlYTucUYOews+WeEujDoEGziz4K6c47V/Bd+LjSSYcA94p+DmINdf7ncaUinThfvZyu13lN9OY1XDxt8C0Tw0g==",
+          "version": "7.5.4",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
+          "integrity": "sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==",
           "dev": true,
           "requires": {
             "lru-cache": "^6.0.0"
@@ -7712,9 +7712,9 @@
       "dev": true
     },
     "json5": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.1.tgz",
-      "integrity": "sha512-1hqLFMSrGHRHxav9q9gNjJ5EXznIxGVO09xQRrwplcS8qs28pZ8s8hupZAmqDwZUmVZ2Qb2jnyPOWcDH8m8dlA==",
+      "version": "2.2.3",
+      "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.3.tgz",
+      "integrity": "sha512-XmOWe7eyHYH14cLdVPoyg+GOH3rYX++KpzrylJwSW98t3Nk+U8XOl8FWKOgwtzdb8lXGf6zYwDUzeHMWfxasyg==",
       "dev": true
     },
     "kleur": {
@@ -8054,9 +8054,9 @@
       "dev": true
     },
     "semver": {
-      "version": "6.3.0",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
-      "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
       "dev": true
     },
     "shebang-command": {
@@ -8269,9 +8269,9 @@
       },
       "dependencies": {
         "semver": {
-          "version": "7.3.7",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.7.tgz",
-          "integrity": "sha512-QlYTucUYOews+WeEujDoEGziz4K6c47V/Bd+LjSSYcA94p+DmINdf7ncaUinThfvZyu13lN9OY1XDxt8C0Tw0g==",
+          "version": "7.5.4",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
+          "integrity": "sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==",
           "dev": true,
           "requires": {
             "lru-cache": "^6.0.0"
diff --git a/src/brackets/index.js b/src/brackets/index.js
index 96b6766..c683aeb 100644
--- a/src/brackets/index.js
+++ b/src/brackets/index.js
@@ -4,6 +4,27 @@
  * @param {string} str The string of brackets.
  * @returns {"valid" | "invalid"} Whether or not the string is valid.
  */
-function isValid(str) {}
+function isValid(str) {
+    let arrBracket = [];
+
+    for (let i in str) {
+        if (str[i] == '(' || str[i] == '[' || str[i] == '{') {
+            arrBracket.push(str[i]);
+        } else {
+            let braInd = arrBracket.length - 1;
+
+            if (str[i] == ')' && arrBracket[braInd] == '(') {
+                arrBracket.pop();
+            } else if (str[i] == ']' && arrBracket[braInd] == '[') {
+                arrBracket.pop();
+            } else if (str[i] == '}' && arrBracket[braInd] == '{') {
+                arrBracket.pop();
+            } else {
+                return 'invalid';
+            }
+        }
+    }
+    return arrBracket.length == 0 ? 'valid' : 'invalid';
+}
 
 module.exports = isValid;
diff --git a/src/roman-numerals/index.js b/src/roman-numerals/index.js
index 38afb19..f7bcf2b 100644
--- a/src/roman-numerals/index.js
+++ b/src/roman-numerals/index.js
@@ -4,6 +4,29 @@
  * @param {string} roman The all-caps Roman numeral between 1 and 3999 (inclusive).
  * @returns {number} The decimal equivalent.
  */
-function romanToDecimal(roman) {}
+function romanToDecimal(roman) {
+    const values = {
+        I : 1,
+        V : 5,
+        X : 10,
+        L : 50,
+        C : 100,
+        D : 500,
+        M : 1000,
+    }
+    let result = 0;
+    let previousChar = 0;
+    for (let i = roman.length -1; i >= 0; i--){
+        const currentChar = values[roman[i]];
+        if (currentChar < previousChar){
+            result -= currentChar;
+        } else {
+            result += currentChar;
+        }
+        previousChar = currentChar
+    }
+    return result
 
+}
+  
 module.exports = romanToDecimal;
diff --git a/src/transpose/index.js b/src/transpose/index.js
index adec201..701ae11 100644
--- a/src/transpose/index.js
+++ b/src/transpose/index.js
@@ -4,6 +4,15 @@
  * @param {number[]} array The array to transpose
  * @returns {number[]} The transposed array
  */
-function transpose(array) {}
+function transpose(array) {
+    let transposedArr = [];
+    for (let i=0; i < array[0].length; i++){
+    transposedArr[i] = [];
+        for (let j=0; j < array.length; j++){
+            transposedArr[i][j] = array[j][i]
+        }
+    }
+return transposedArr     
+}
 
 module.exports = transpose;