A note to Admin

I think there is a glitch in the calculator output.

$${\mathtt{9.09}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{{\mathtt{8}}}{\mathtt{\,-\,}}{\mathtt{2\,569.98}} \approx {\frac{-{\mathtt{1\,794\,768\,755}}}{{\mathtt{50}}}} \approx {\mathtt{908\,997\,430.02}}$$

That minus sign in the working should not be there. 

Also,

1) can we get a scientific notation display alternative for the forum calulator.  I don't think it is there yet.

2) Thanks for improving the topic choice list.  Could you please include Trigonometry, I don't think it is there yet.  

3) Can you include another level for difficulty?  Maybe it could be indicated with a number or stars or some other symbol?

4) In LaTex I would really love an array sub-routine pre-set like you have with matrices.  I would use it all the time. 

Thanks.

Melody.