Melody

just like that

-2^8=

$${\mathtt{\,-\,}}\left({{\mathtt{2}}}^{{\mathtt{8}}}\right) = -{\mathtt{256}}$$

If you are using the calc keys then it is     -2   x^y   8   =

This does look like a great question with equally great answers.     

Thanks Dbg,

I am glad that you have been happy here :)

A great answer civonamzuk    

I think  I will put this one in with the puzzles.  Thanks for providing it anon   

They are not exponents

water is          $$H_2O$$

This means that each water molecule is made up of 2 hydrogen atoms and one oxygen atom.  

$$2C + 3H_2O_3$$

You make a great contribution to this forum Zac :))

How do you know?

I do not even know what the shape is!

That looks very impressive Heureka :))

No there isn't one.

Degrees and radians are different units to measure angles in.

It is like you can measure distance in either kilometres or miles.