diff --git a/src/brackets/index.js b/src/brackets/index.js
index 96b6766..9da4916 100644
--- a/src/brackets/index.js
+++ b/src/brackets/index.js
@@ -4,6 +4,26 @@
  * @param {string} str The string of brackets.
  * @returns {"valid" | "invalid"} Whether or not the string is valid.
  */
-function isValid(str) {}
+function isValid(str) {
+    let brackets = "[]{}()<>"
+    let stack = []
+    for(let bracket of str) { 
+        let bracketsIndex = brackets.indexOf(bracket) 
+        if (bracketsIndex === -1){ 
+            continue
+}
 
+if(bracketsIndex % 2 === 0) {
+     stack.push(bracketsIndex + 1) 
+    } else {
+        if(stack.pop() !== bracketsIndex) {
+             return false;
+            }
+            }
+}
+return stack.length === 0 ? "valid" : "invalid";
+}
 module.exports = isValid;
+
+
+
diff --git a/src/roman-numerals/index.js b/src/roman-numerals/index.js
index 38afb19..6955d34 100644
--- a/src/roman-numerals/index.js
+++ b/src/roman-numerals/index.js
@@ -4,6 +4,23 @@
  * @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 romanSymbols = {
+        "I": 1,
+        "V": 5,
+        "X": 10,
+        "L": 50,
+        "C": 100,
+        "D": 500,
+        "M": 1000  }
+      let answer = 0;
+      for (let i = 0; i < roman.length; i++){
+        const now = romanSymbols[roman[i]];
+        const later = romanSymbols[roman[i + 1]];
+        if (now < later){
+          answer += later - now;
+          i++;
+        } else answer += now  } return answer
+}
 
 module.exports = romanToDecimal;
diff --git a/src/transpose/index.js b/src/transpose/index.js
index adec201..a0c8252 100644
--- a/src/transpose/index.js
+++ b/src/transpose/index.js
@@ -4,6 +4,36 @@
  * @param {number[]} array The array to transpose
  * @returns {number[]} The transposed array
  */
-function transpose(array) {}
+function transpose(array) {
+
+    let newArr = []
+    let length = ''
+    let length2 = ''
+  for (let i = 0; i < array.length; i++) {
+    length = array[i]
+    for (let j = 0; j < array[i].length ; j++) {
+      length2 = array[j]
+        newArr.push(length2[i])
+        
+    }
+    
+  }
+  let size = length.length; let arrayOfArrays = [];
+for (var k=0; k<newArr.length; k+=size) {
+     arrayOfArrays.push(newArr.slice(k,k+size));
+}
+
+return arrayOfArrays
+}
+
+let a = [
+    [9, 1, 2, 3],
+    [4, 5, 6, 7],
+    [8, 9, 10, 7],
+    [1, 3, 1, 5],
+  ]
+
+
+  console.log(transpose(a))
 
 module.exports = transpose;