I am trying to write simple formulas on my blog, but i simply read what I write in the editor, i don´t even get the yellow alert message.

this is the formula $latex v=tfrac{1}{2}cdot a cdot t^2$ (which parses in any other Latex parser)

and this is the page http://vitomakes.wordpress.com/2013/11/08/salvaged-mechanics/

I have even tried the examples of http://en.support.wordpress.com/latex/, they also don´t work.

Thanks a lot to whom wants to help

The blog I need help with is vitomakes.wordpress.com.