Melody

So, if I have an angle, say it's 135o, that simplified would be 45o right? But if I have an angle, say 330o, it simplifies to 30o rather than 60o? Why?

Here is a page with some pretty and interactive diagrams (if you scroll down a bit) that may help you.

Hi  Mathcalc,

A group has an equal number of adults and children. 

Let K be the number of children (kids)    Sinve there is the same number of adults then K is the number of adults too

When n oranges are given to the group, each adult gets two oranges while each child gets one orange

and there are still 5 oranges left.

The adults get 2 oranges each that is 2K oranges and the children get 1 orange each, that is K oranges and there is 5 oranges left over.

SO

n = 2K+K+5

Write an algebraic expression for the number of oranges given to the adults.

n=3K+5

n-5=3K

K=(n-5)/3

but the adults get twice this many oranges so the adults get

2(n-5)/3    oranges.

CPhill's answer is the same, he has just not simplified it. and i used a k instead of an x

Does that help ?

Do you want me to discuss the others as well. OR maybe if you need more explanation, CPhill might like to help you.

We like it when people ask us about our answers.  It means we are really teaching someone :))

(Sometimes we wonder if anyone even reads an answer)

why is negative 2 squared negative 4

\((-2)^2=-2*-2=+4\\~\\ BUT\\~\\ -2^2=-1*2^2=-1*2*2=-4\\~\\ \mbox{It has to be like this because otherwise } 10-2^2\quad\mbox{would give the same answer as }10+2^2\)

That depends, are the units the same.?  

Without the units neither have any weight so  they are equal in weight.

[2nd][asin] number

Hi Shades,

I know I already answered this question this morning so I am assuming that when this one did not get answered that you reposted.

You are encouraged to repost, reposted questions that are correctly labeled get priority.

BUT

Please Do Not rewrite the question.

Copy the address of your original question and paste it into the post.

(Most of you can do this by highlighting the address in the address bar - right click - choose copy from the menu.  Then place curser where you want it in the new post, right click and choose paste from the drop down menu)

[I added this for other]

This way your question will not be answered twice.  Answerers are too busy for that - there are always other people waiting. 

An example of what you might like to call yours   

"Unanswered complex number question - Please help me."

A note to potential answerers.

Always answer the question on the original post.

It would also be heplful if you posted on the new thread that the question was now answered by you,:)

-x^2-x^2

\(-x^2-x^2=-2x^2\)

What is the square root of 90 divided by the cube root of 86,485,393 multiplied by -5,954,828

A friend of mine, who happens to be a math teacher, gave me this random super-hard math problem, so I want to know what the answer is. Also, the square root of 90 is divided by the cube root of 86,485,393 which is multiplied, not after, but in the bracket, by -5,954,828

In what brackets?

Anyway, this is a calculator site so use the calculator/.

It is undefined.

You cannot divide any number by 0.

You are very welcome Shades :)

You probably already have a good text book but I found this online.  Maybe it will be helpful.