What is the word for a named region in memory used to store a value?

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What will the statement "myNum $=2+2"$ store in myNum?

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If the previously$-$entered statement was "num$1=9",$ what value will be stored in num$2$ after the statement "num$2=$ num$1*$ num$1"?$

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If the previously$-$entered statement was "num $1=5",$ what value will be stored in num$2$ after the statements "num$1=$ num$1+$ num$1"$ followed