Given the Cost Function, C(x), and the Revenue Function, R(x)

question 48

Multiple Choice

Given the cost function, C(x) , and the revenue function, R(x) , find the number of units x that must be sold to break even.
-Three trains  one eastbound, one westbound, and one northbound  leave a city at the same time. The speed of the northbound train is 10 miles per hour greater than the speed of the eastbound train. After 2 hours, the
Distance between the westbound train and the eastbound train is 200 miles. Twice the speed of the westbound
Train is 100 miles per hour more than the speed of the northbound train. Find the speeds of the three trains.

• A) eastbound, 40 mph; westbound, 70 mph; northbound, 30 mph
• B) eastbound, 20 mph; westbound, 80 mph; northbound, 40 mph
• C) eastbound, 30 mph; westbound, 70 mph; northbound, 40 mph
• D) eastbound, 40 mph; westbound, 70 mph; northbound, 50 mph

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Definitions:

UCS

An acronym for Unconditioned Stimulus, a stimulus that naturally and automatically triggers a reflexive response without prior learning.

UCR

Unconditioned Response, which is an automatic and involuntary reaction to a stimulus that occurs naturally without any prior learning or conditioning.

Dog's Bark

The vocal sound made by dogs as a form of communication with humans or other animals.

Accelerated Breathing

Rapid or increased respiration rate, commonly occurring in response to stress, exercise, or medical conditions.