Question 1160145
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It is because the person,  who created answers to this multiple choice question,  DOES  NOT  know  Math.


What I can advise you ? --- Ignore everything you get from this source.


If you want to learn  Math,  use other sources.


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At nova days,  there are  THOUSANDS  of people in the  Internet,  who call,  present and position
themselves as tutors,  but in reality,  know  NOTHING  in  Math and absolutely unable to teach.


Unfortunately,  nobody fights with them . . . 


Actually,  they are rogue and self-proclaimed persons.


But again,  nobody fights with them . . . 


<pre>
    Imagine for a minute, that the service, that takes out garbage in your city, stop working . . . 

    The same is in the Internet with such "quasi-" and "pseudo-" tutors.
</pre>

To find a really good tutor is a really big problem . . .