As you present your speech, you notice that many of your listeners have interested looks on their faces and are nodding their heads in agreement with your ideas. according to your textbook, these reactions by your listeners are called:

"Positive Feedback"

Explanation:

When you are giving a speech and see that the crown is excited or interest and they are nodding their heads in agreement this is usually called "Positive Feedback". This let's the person giving the speech know that people are reacting positively to what he is saying and that he can continue in the same route that he is taking without having to change the game plan of his speech in order to get people's attention.

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answer: a

explanation:

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by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.