Melody

I love those crocodile tears Civonamzuk!     

didig    Stop giving people negative points - it will come back to haunt you!   

Yes, that is correct   

$$\\0.\bar3=\frac{1}{3}\\\\
3*0.\bar3=3*\frac{1}{3}\\\\
therefore\\
0.\bar9=1\\\\\\
1-0.\bar9 = 1-1 = 0$$

Yes that could be :)

Yes Rosala, you should not have the % sign in your answer :)

When it works, what does it do anon?

it means "to the power of"

Sometimes it is called a 'hat'   It's real name is  a 'caret'

do not confuse this with carrots that rabbits like to eat

or carats that is a weight measure for gems      

3 and 5/2 is not a proper mixed numeral.  Perhaps I do not understand your question!

I do it like this

180 degrees = pi radians                This is all that I remember

so

1 degree = pi/180    radians

so

220 degrees must = 220 *  pi/180   radians