Use the following to answer questions:
Figure: The Demand Curve for Oil 
-(Figure: The Demand Curve for Oil) Look at the figure The Demand Curve for Oil. Demand is price _____ between $20 and $21, since total revenue _____ when the price _____.
Definitions:
Electrical Noise Interference
Disturbances in electrical signals caused by external sources that can disrupt or degrade the performance of electronic equipment.
Logic Circuits
Electrical circuits designed to perform logical operations, processing digital signals according to boolean algebra.
Allen-Bradley SLC-500
A robust line of programmable logic controllers (PLCs) by Rockwell Automation, designed for small to medium-sized control applications.
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