Melody

Because by definition, a triangle is a polygon with 3 sides.   :)

2/3x +14+1/3x

I just entered this into the web2.0 calculator and it gave me the answer no problems.  :)

I did have to put the * for times where it was needed.  That is all though ://

2/3*x +14+1/3*x = x+14

Beats me.

There are 20 b***s in the red bag and 21 b***s in the blue bag

 There is 41C20 combination are possible

269128937220 = 2.6912893722e11

That is a lot of combinations!

cosx=(1+(sin^2 (x))^1/2

Well

\(cos^2x+sin^2x=1\\ cos^2x=1-sin^2x\\ cosx=\pm\sqrt{1-sin^2x}\\ \)

So no, your statement is not true :)

xy+xy = 2xy

16x^8y^2)^1/2

sqrt(16x^8y^2)

4x^?y

 ~  what is the square root of x^8?

since  

\(x^4*x^4=x^8\\ \sqrt{x^8}=x^4\)

\(\sqrt{16x^8y^2}\\ =\sqrt{4*4*x^4*x^4*y*y}\\ =\sqrt{(4*x^4*y)\;\;\;*\;\;\;(4*x^4*y)}\\ =4*x^4*y\\ =4x^4y\)

Hi Rom, it is good to see you here  :)

There are no parabolas unless they are invisable. 

And it is a bit hard to tell with invisable parabolas ://

rarinstraw, CPhill and ClaraOswald

Thanks rarinstraw and Chris, my second step is most certainly incorrect.

{4 3\over 5} 

Clara, this is unclear, you are right to think that it looks like it means   4+3/5     BUT

it is written in LaTex and it does really mean     43/5      like I put :)

Copy it and then open  LaTex using the button above button.

Now paste it in press enter and see what the output looks like  :)