diff --git a/.idea/misc.xml b/.idea/misc.xml
index 639900d..cbbff6a 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="openjdk-20" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/Java-Assignment-004.iml b/Java-Assignment-004.iml
index b46c0dd..e1006ff 100644
--- a/Java-Assignment-004.iml
+++ b/Java-Assignment-004.iml
@@ -5,6 +5,7 @@
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
     </content>
+    <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
 </module>
\ No newline at end of file
diff --git a/src/Multadd.java b/src/Multadd.java
new file mode 100644
index 0000000..517ef54
--- /dev/null
+++ b/src/Multadd.java
@@ -0,0 +1,35 @@
+public class Multadd {
+
+    public static double multadd(double a, double b, double c) {
+        return a * b + c;
+    }
+
+    public static void main(String[] args) {
+        // This next line isn't necessary, but I'm given to understand from googling it, that adding this as a constant helps with clarity and reliability.
+        final double PI = Math.PI;
+        double result1 = multadd(2.0, 4.0, 6.0);
+        System.out.println("multadd(2.0, 4.0, 6.0) = " + result1);
+        double result2 = multadd(1.5, 3.14, -2.7);
+        System.out.println("multadd(1.5, 3.14, -2.7) = " + result2);
+        double result3 = multadd(0.0, 10.0, 0.0);
+        System.out.println("multadd(0.0, 10.0, 0.0) = " + result3);
+
+        double sinPi4 = Math.sin(PI / 4);
+        double cosPi4 = Math.cos(PI / 4);
+        double log10_10 = Math.log10(10);
+        double log10_20 = Math.log10(20);
+        double formula1 = multadd(sinPi4, cosPi4 / 2, 0);
+        System.out.println("sin(pi/4) + cos(pi/4)/2 = " + formula1);
+        double formula2 = multadd(log10_10, log10_20, 0);
+        System.out.println("log10(10) + log10(20) = " + formula2);
+        double x = 1.23;
+        double expSumResult = expSum(x);
+        System.out.println("expSum(" + x + ") = " + expSumResult);
+    }
+
+    public static double expSum(double x) {
+        double expX = Math.exp(-x);
+        double sqrtTerm = Math.sqrt(1 - expX);
+        return multadd(x, expX, sqrtTerm);
+    }
+}
\ No newline at end of file