For the joint-cost function c = 3xy + 5x + 2y + 6000 (in $),determine the marginal costs 
and 
when 
and y = 20.
Definitions:
Primary Emotion
Basic emotions that are universally recognized and experienced by all humans, such as happiness, sadness, fear, and anger.
Disgust
An emotional response of revulsion to something considered offensive, distasteful, or unpleasant.
Circumplex Model
A model describing different emotions as points in a circular space, defined by their level of arousal and valence.
Valence
The intrinsic attractiveness/good-ness or averseness/bad-ness of an event, object, or situation.
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