The marginal cost of manufacturing x yards of a certain fabric is 
in dollars per yard.Find the increase in cost if the production level is raised from 
yards to 
yards.
Definitions:
Iris
The pigment-rich section of the eye responsible for regulating pupil size and, therefore, the quantity of light entering the eye.
Controlled
Pertains to experimental conditions that are manipulated or regulated by the researcher to isolate cause and effect relationships.
Human Eye
A complex organ capable of receiving visual images, which are then processed by the brain, it comprises structures such as the cornea, iris, lens, and retina.
Camera
A device for capturing visual images in the form of photographs, video recordings, or digitally.
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