Question 1111839
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The rule of this forum is:

<H3>One and only one problem per post</H3>


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Regarding your question #3, &nbsp;simply &nbsp;<U>OPEN YOUR EYES</U>, &nbsp;<U>look into the question</U>&nbsp; and &nbsp;<U>think what does it mean</U>.


If you can not answer this question on your own, &nbsp;then YOU ARE IN WRONG CLASS.


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<pre>
Let me explain you something.


The question #3 is of the level 0 (LEVEL ZERO).


It means you do not need think to answer this question: you simply MUST KNOW how to answer.


This question (and such questions) is intended / (are intended) for only one goal: to check if you know the basics, 
i.e. definitions that your teacher gave you in school.


We, the tutors of this site, do not teach you at the level zero. It is not our function. 
We are not going to repeat here what is written in your textbooks and what you MUST know before asking your questions.


It is yours and your school teacher function/duty/responsibility to learn/(to provide you) these basics.


Our functioning starts from more high levels, where thinking is really need.
</pre>

In other words, when you come to this forum with your questions,

we assume that you at least know the basics and understand the meaning of a question.