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Carbon is in group 4 of the periodic table therefore has 4 electrons in its outer shell which are available for bonding. Each carbon atom in graphite forms 3 covalent bonds with another carbon atom within...

Hola Pedro,
¡Cuánto tiempo! Pues, cuando estoy con mis amigos hacemos un montón de cosas, como jugar al deporte o salir a los centros comerciales. Pero en los días en los que no nos podemos ver, sole...

Opportunity cost is something that we think about everyday but we don't always use that word. It is defined as the benefits lost from the next best alternative choice.This sounds wordy, but in an example ...

With regular verbs, forming the present participle requires three easy steps:Conjugate the verb into its 'nous' form, eg. jouer - jouons / finir - finissons / vendre - vendonsNow, remove this ending. This...

Completing the square is nice and easy. If you have an equasion of the form x²+ax+b=0 then simply rewrite the equasion in the form (x+a/2)²-(a/2)² +b=0. This may sound com...