The .pdf file below titled "Notes Center of Mass 9.1_9.2" contains the following information:
page 1 & page 2 - further explanation of text notes on pages 202 & 203
page 3 - finding c.o.m. with two methods - the first uses the geometrical center, the second uses (9-5) from page 203
page 4 - center of mass strategies from the top of page 206
page 5 - example for (9-9) at bottom of page 203, example shown twice with origin in two different locations
page 6 - example for a rod of non-linear density