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The subjunctive is used to express wishes, emotions, impersonal expressions, doubt/denial and ojalá. To remember these siutations, the acronym WEIRDO is very helpful. Examples of impersonal expressions inclu...

Enzymes are biological catalysts that speed up chemical reactions by providing an alternative reaction pathway with lower activation energy.

'Por' and 'para' both usually translate into English as 'for'. There is no firm distinction between the two so it is necessary to learn when you would use either 'por' or 'para'. Por: Duration of time e.g. T...

To solve this problem we will use a clever substitution to easily integrate and thus obtain the answer.First we can represent tan(x) as its fractional equivalent sin(x)/cos(x), assigning the variable u to co...

First, we need to remove one of the variables from one of the equations. In this case, we multiply the first equation by 4 to give 12x+4y=28.Then minus the 2nd equation from this to give 10x+0y=20.Now divide...