diff --git a/sections/section9/section9.pdf b/sections/section9/section9.pdf new file mode 100644 index 0000000..cd1f82f Binary files /dev/null and b/sections/section9/section9.pdf differ diff --git a/sections/section9/section9_soln.pdf b/sections/section9/section9_soln.pdf new file mode 100644 index 0000000..bf302a4 Binary files /dev/null and b/sections/section9/section9_soln.pdf differ