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Quest'estate è stata speciale. Invece di fare una vacanza di pochi giorni all'estero, la mia famiglia ha ospitato uno studente straniero, con il quale abbiamo fatto tante gite fuori porta, ma senza uscire da...

Anything raised to the zeroth power is a difficult thing to get your head around. The easiest explanation (not a full proof) is to look at what happens as we go down in powers of n: n^3=n n n n^2=(n^3)/n=n n...

Current is defined as 'the flow of electric charge'. It can be broken down into very simple system of electrons, who carry charge, moving around a circuit. Potential difference can be thought of the force th...

Many Spanish words have accent marks (e.g. móvil , habló or fantástico ). While this seems odd for english speakers, the rules followd in Spanish are suprisingly straightforward! Accents mark word stress . T...

Remeber the formula: (a - b) 2 = a 2 - 2ab + b 2 . Notice that y = x 2 - 2 3 x + 5, so we want to write this using (x - 3 ) 2 = x 2 - 2 3 x* + 9. Taking 4 from both sides gives: (x - 3) 2 - 4 = x 2 - 6x + 5 ...