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PLEASE HELP!!!!!

What identifies whether the given operation is closed or not closed with respect to each set of numbers.

A. Closed
B. Not closed


Positive integers are ___________ under subtraction.

Rational numbers are ____________ under multiplication.

Negative real numbers are _________ under division.

Irrational numbers are __________ under addition.

Respuesta :

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You need to be more specific, i can't answer the question without it

Answer:

1st is not closed.

2nd is closed

3rd is not closed

4th is closed

Step-by-step explanation:


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