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The heart made up of four chambers; two atria at the top and two ventricles at the bottom. There are effectively two pumps. The pump on the right side of the heart sends blood to the lungs to be oxygenate...

The imperfect tense is used to express the idea that something is happened continuously in the past. It translates in English as "I was X-ing".
To form the imperfect tense, you take the pre...

Pythagoras' theorem states that in any right-angled triangle the square of the longest side (called the HYPOTENUSE) is equal to the sum of the squares of the other two shorter sides.If th...

Undeniably, one of the most noticeable differences between the texts is that they portray America in vastly contrasting economic states. Not only was the 20s a significantly richer and more lavish decade,...

First take the 3 over the other side to make the right hand side zero, turning it into a homogeneous equation: 3a²+4a-2=0. Since the expression on the left hand side cannot be factorised, we ha...