How do I show the rightarrow sign?

Like this? [math]\to[/math]

 

I used the LaTeX BBCode. Click the image to see.

Which image are you talking about?

The arrow is actually an image. Click on it.

How do I show the rightarrow sign?

If you have Windows you can open Character Map.

Go to → All Programs → Accessories → System Tools → Character Map

Then choose the Font Set you want (Arial has a right arrow; not all sets do). scroll to the Right Arrow, click on it, click on Select, click on Copy. Now it's on your Clipboard and you can paste it into the text editor. You can resize it there if you want a bigger arrow. →

How do I show longrightarrow?

How do I show longrightarrow?

\Longleftarrow

This code;

[math]\LongleftarrowA[/math]

gives this display; [math]\Longrightarrow A[/math]

 

There is also a left long-arrow : \Longleftarrow

 

Again, here is a library of Latex symbols: LaTeX:Symbols @ Art of Problem Solving