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Mitochondria are the 'powerhouses' of the eukaryotic cell. These organelles are the sites of cellular respiration, the metabolic process that generates energy from carbohydrates in the cell. The energy...

You can only use the perfect tense, "haber + perfect participle" when something is either very recent or is still ongoing. "Ayer", yesterday, is definitely not still going on, and i...

When dealing with the subjunctive, there are two acronyms which, if committed to memory, will help you massively with learning in which situations the subjunctive needs to or needn't be used.

We can express the equation of any circle in the form (x - a)^2 + (y- b)^2 = r^2. The centre of the circle is then the point (a, b) and its radius is ...

The gradient of a line in the form y = ax + b, where a and b are some numbers, is the number a.

So we need to get the equation 3x + 5y = 7 into the above...