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The pluperfect tense helps to add extra information to an account from the past. It refers to events that took place before the events of the story in the past. For example, I went to the concert b...

Denominator of the power expression indicates the degree of the root in this case its the cubic root. Numeriator denotes the degree of power in this case squared. The negative sign means to inverse the ba...

One way in which the effectiveness of checks on Presidential power is lacking is war powers. In the Constitution the President cannot declare war only Congress can. Congress has not declared war since 194...

It depends on the context and sentence. But, as a general rule, you use the preterite when you're talking about an action that had a clear start and a clear end. An example of that would be 'Paul taught h...

Menstruation in women is under the influence of the hypothalamic-pituitary-ovarian axis, or HPO axis. The pituitary gland secretes follicle-stimulating hormone (FSH) and luteinising hormone (LH), which ac...