Use the Midpoint Rule with four squares of equal size to estimate the double integral. 
Definitions:
Infant-Directed Speech
A speaking manner used by adults with higher pitch, slower tempo, and exaggerated intonation when talking to infants, believed to aid language acquisition.
Simple Sentences
Sentences that contain only one independent clause and express a complete thought.
Language-Acquisition Device
The language-acquisition device is a hypothetical mechanism proposed by Noam Chomsky that the human brain is equipped with, facilitating the learning of language.
Universal Grammar
A similar underlying structure shared by all the world’s languages, according to linguist Noam Chomsky.
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