added review10 to chapter13

Author: trapperdot00

Chapter13/README.md

@@ -95,3 +95,6 @@ How do you color and label a graphed function?
 
 ## [Review 9](review/09.txt)
 What do we mean when we say that a series approximates a function?
+
+## [Review 10](review/10.txt)
+Why would you sketch out the layout of a graph before writing the code to draw it?

Chapter13/review/10.txt

@@ -0,0 +1,6 @@
+So that we can get a schematic view of the overall look of our graph,
+and we can store offsets and spacings in symbolic constants that makes
+it easier to calculate exact coordinates inside our graphing area.
+
+And afterall, it would be hard to code something,
+that we don't even understand the design of.