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Answer: z+7*y+9*t

12yaks and 5 xylophones

a xylophone is the same as 1 xylophone.  

Here is one

6y+9t-y+2y+z      (t can be trains if you like)

Take a look.

Gradient is rise over run the same as when you talk about the gradient of a line.

The gradient of a curve is really the gradient of the tangent to the curve at a given point.

A tangent is a line that just touches the curve.    :)

Oh okay! Thanks so much Melody! I was sure the professor was pulling my leg, he did it once before lol.

Also what is gradient? Is that another word for function?

Oh. You have 12 yaks and 4 xylophones.

It means the costs are the same as the profit so he didn't make or lose any money.

Sorry I get you.  you have 21 things I guess.  No it doesn't work that way.

you have to keep the xylophones and the yaks seperate!

This is not an answer Dragon.  

I don't think admin spends as much time on the other forums (except German maybe).  He only has 24 many hours in his day too!

ok I fixed it.   

$${\mathtt{10}}{\mathtt{\,\times\,}}{\mathtt{7}} = {\mathtt{70}}$$

$${\mathtt{70}}{\mathtt{\,\small\textbf+\,}}{\mathtt{100}} = {\mathtt{170}}$$

No it is my mistake  -  give me  a little while and I will fix it.

Oh. I try to think of a god name, and then a better name I think of appears, but I can't change the title.

Is it even a math question??

Xylophones and yaks.

Thanks for answering Melody. Yes, the question is written exactly like how it is on the paper. I just texted someone in my class. We think that it is just a bullsh#$ question.... -_- 

What do you think? Is this a trick question?

yes it is the same for everyone - it is a pest.

3x+4y+y+8x

If you have 3 xylophones and 4 yaks, and another xylophone and another 8 yaks 

I have xylophones and yaks,  you have 21 what exactly?

21? Why are you asking this? I don't ask this in a mean way.

SABRINA       p=36+12d

LOU              P=15d

solve simultaneously.    

What?

3x+4y+y+8x

If you have 3 xylophones and 4 yaks, and another xylophone and another 8 yaks 

What do you have?

It is like: A WIZARD OF EARTHSEA

btw, let's do the math!

How much does y equal? If x is by itself, it equals 1. If y is by itself, it equals _______.

what does y equal when it's by itself?

The number that is in front of a letter

5x    the coefficient of x is 5

How about using the home page calculator?

$${\mathtt{36}}{\mathtt{\,-\,}}{\frac{{{\mathtt{e}}}^{{\mathtt{x2}}}}{{\mathtt{1}}}}{\mathtt{\,-\,}}{{\mathtt{e}}}^{{\mathtt{36}}}{\mathtt{\,-\,}}{\mathtt{x2}} = {\mathtt{\,-\,}}{\mathtt{x2}}{\mathtt{\,-\,}}\left({{\mathtt{e}}}^{{\mathtt{x2}}}\right){\mathtt{\,-\,}}\left({{\mathtt{e}}}^{{\mathtt{36}}}\right){\mathtt{\,\small\textbf+\,}}{\mathtt{36}}$$