diff --git a/education/software development/ECE1400/Chapter 9 Exercises.md b/education/software development/ECE1400/Chapter 9 Exercises.md
index cb7e302..ebc3876 100644
--- a/education/software development/ECE1400/Chapter 9 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 9 Exercises.md	
@@ -46,4 +46,22 @@ All of them are legal and will compile and run. (c) and (d) are what I would con
 
 Answer:
 (a) and (b).
-Parameters must contain a type annotation but theyd o 
\ No newline at end of file
+Parameters must contain a type annotation but they do not need to specify a name. A function prototype declaration must specify a return type.
+
+> 9. What will be the output of the following program?
+```c
+double triangle_area(double base, double height)
+{
+	double product;
+	product = base * height;
+	return product / 2;
+}
+double triangle_area(double base, double height)
+{
+	double product;
+	product = base * height;
+	return product / 2;
+}
+
+```
+