Okay, so first off what mural? Second what are the measurements? I need this information for me to able to help you. Also, I'd think that this a Math question not a Spanish question. :)
B. Digo
You siempre digo que hay que reciclar.
Answer:
Well I get in at 9:30 and end till when where I finish very class, Monday thru Friday
Explanation:
Because I take classes at home
"sobre" would be the correct answer.