from your other posts i gather that you are in middle school. A lot of formulas for sound involve some higher math, namely logarithms for decibels. now i don't know how advanced your math is but in anycase here is a site with some background formulas. also remember that with sound you work with electricity so i included some electrical formulas.
http://harada-sound.com/sound/handbook/basicterms.html
http://harada-sound.com/sound/handbook/basicelec.html
also check out some of the links from that site.
If all else fails...google it