Find the centroid of the region shown, not by integration, but by locating the centroids of the rectangles and triangles and using additivity of moments. 
Definitions:
Mnemonic Device
Strategy to aid memory.
Elaboration
The process of adding more detail or information to something, often used to enhance memory or understanding.
First Five Presidents
Refers to the initial five presidents of the United States: George Washington, John Adams, Thomas Jefferson, James Madison, and James Monroe, who served in office from 1789 to 1825.
Selective Attention
The cognitive process of focusing on a specific aspect of information while ignoring other perceivable information.
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