new commit for approval

NumberUtilities.java

 
 public class NumberUtilities {
     
-    public static String getRange(int start) {
-        return null;
+    public static String getRange(int stop) {
+        String ans = "";
+        
+        for (int i = 0; i < stop; i++) {
+            ans = ans + i;
+        }
+        return ans;
     }
     
     public static String getRange(int start, int stop) {
-        return null;
+        String ans = "";
+        
+        for (int i = start; i < stop; i++) {
+            ans = ans + i;
+        }
+        return ans;
     }
 
 
     public static String getRange(int start, int stop, int step) {
-        return null;
+        String ans = "";
+        
+        for (int i = start; i < stop; i += step) {
+            ans = ans + i;
+        }
+        return ans;
     }
     
     public static String getEvenNumbers(int start, int stop) {
-        return null;
+        String ans = "";
+        
+        for (int i = start; i < stop; i++) {
+            if (i % 2 == 0) {
+                ans = ans + i;
+            }
+        }
+        return ans;
     }
 
 
     public static String getOddNumbers(int start, int stop) {
-        return null;
+        String ans = "";
+        
+        for (int i = start; i < stop; i++) {
+            if (i % 2 != 0) {
+                ans = ans + i;
+            }
+        }
+        return ans;
     }
 
 
     public static String getExponentiations(int start, int stop, int exponent) {
-        return null;
+        String ans = "";
+        
+        for (int i = start; i <= stop; i++) {
+            ans = ans + ((int)Math.pow(i, exponent));
+        }
+        return ans;
     }
 }

TableUtilities.java

 
 public class TableUtilities {
     public static String getSmallMultiplicationTable() {
-        return null;
+        return getMultiplicationTable(5);
     }
 
     public static String getLargeMultiplicationTable() {
-        return null;
+        
+        return getMultiplicationTable(10);
     }
 
     public static String getMultiplicationTable(int tableSize) {
-        return null;
+        StringBuilder rows = new StringBuilder();
+        
+        for (int i = 1; i <= tableSize; i++){
+            for (int j = 1; j <= tableSize; j++) {
+                rows.append(String.format("%3d |", i*j));
+                
+            }
+            rows.append("\n");
+        }
+        return rows.toString();
     }
 }

TriangleUtilities.java

 public class TriangleUtilities {
 
     public static String getRow(int numberOfStars) {
-        return null;
+        StringBuilder star = new StringBuilder();
+        
+        
+        for (int i = 0; i < numberOfStars; i++) {
+            star.append("*");
+        }
+        return star.toString(); 
     }
     
     public static String getTriangle(int numberOfRows) {
-        return null;
+        StringBuilder row = new StringBuilder();
+        for (int j = 1; j < numberOfRows + 1; j++) {
+            
+            String triangle = getRow(j);
+            
+            row.append(triangle + "\n");
+        
     }
+    return row.toString();
+}
 
 
     public static String getSmallTriangle() {
-        return null;
-    }
+        return getTriangle(4);
+}
 
     public static String getLargeTriangle() {
-        return null;
+        return getTriangle(9);
     }
 }