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Select from the drop down menus to correctly identify whether the given operation is closed or not closed with respect to each set of numbers. positive integers are (closed, not closed) under subtraction. rational numbers are (closed, not closed) under multiplication. negative real numbers are (closed, not closed) under division. irrational numbers are (closed, not closed) under addition.

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Answer from: laahmiisy

Not closed; closed; not closed; closed.

Step-by-step explanation:

If we subtract a larger positive number from a smaller positive number, we get a negative number. This means positive integers are not closed under subtraction. Example: 1-3 = -2.

Multiplying two rational numbers will give us a rational number as an answer. This means rational numbers are closed under multiplication.

If we divide two negative numbers, we get a positive number for our answer. this means that negative real numbers are not closed under division.

Adding two irrational numbers will give us an answer that is an irrational number. This means irrational numbers are closed under addition.

Answer from: Quest

the clues that signal the reader should change tone are the punctuation marks, the grammatical signs. for example, the quotation marks at the beginning of something someone else said literally or the exclamation marks.

the tone of the first line of dialogue until "gettysburg" is a kind tone, a tone of advise. the narrator is trying to the other person in doing something he or she obviously is finding hard to do by giving a piece of advise and bringing up a memory of a successful similar case.

the clue that the reader understand how to read the word "bang" is the exclamation mark. it gives the word a surprise tone, a strong accent.

the best tone for reading the word "bang" is an exciting tone, a surprise one, even a loud one.

the words that should be read with a formal tone are the ones that give factual information. the sentence: mister lincoln couldn't think of anything to say at the gettysburg" gives information about an event and it needs to be read formally, also, when the narrator wants to transmit calmness, a formal and slow tone is needed, because people also transmit messages with the vibrations of our voices and tones.

Answer from: Quest

lol we need to see what the question is asking about

step-by-step explanation:

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