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Ser is used in reference to things that are permanent, or unchanging - eg. Soy de Inglaterra. You can't change where you're from, so you need to use ser. Estar is used to describe temporary thing...

First of all let's think about what this really means:

Homogeneous means that all term in the differential equation contain the dependent variable(in most cases y). The dependent variable...

If we have a function f(x), taking its derivative would obtain a new function f'(x). However, now this second function f'(x) defines the tangent along any point on the original graph of f(x). This is u...

Despite probably being brought up using the A=1/2bh formula, there is a more generic formula that works for any triangle shape without any calculations needed to find the height perpendicular to a tria...

Introduction: In the introduction make sure you outline your arguement - it is important to have a strong arguement and to then outline the points you are going to discuss in the essay. Remember a hist...