Suppose demand is given by the equation: 
Using the midpoint method, what is the price elasticity of demand between $7 and $8?
Definitions:
Guided Imagery
A relaxation and mental visualization technique where individuals are guided by a therapist to imagine peaceful and calming images or scenarios.
Epidural Infusion
Type of nerve block anesthesia in which an anesthetic is intermittently or continuously injected into the lumbosacral region of the spinal cord.
Opioid Medication
A class of drugs that interact with opioid receptors in the nervous system to relieve pain; includes both prescription pain relievers and illegal drugs like heroin.
Epidural Catheter
A catheter placed in the epidural space of the spine for the delivery of anesthetic during surgeries or for pain management.
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