Use the following to answer questions: 
-(Table: Production Possibilities for Machinery and Petroleum) Look at the table Production Possibilities for Machinery and Petroleum. The opportunity cost in the United States of producing 30 units of petroleum is _____ units of machinery.
Definitions:
Vouchers
Documents that serve as evidence of authority to make a payment and usually support transactions before they are processed.
Currency
The system of money in general use in a particular country, recognized as a medium of exchange for goods and services.
Alzheimer's Disease
A progressive neurodegenerative disorder characterized by cognitive decline, memory loss, and changes in behavior and personality.
Disorientation
A state of confusion or loss of sense of direction, often experienced in unfamiliar situations or as a result of cognitive impairment.
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