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So "ser" and "estar" both mean "to be".Ser should be used when you're talking about an intrinsic quality of something eg. a description, the time, a characteristic of somethi...

In order to write a high quality essay question it needs to contain some key elements. To make a good impression to your examiner you need to start with a good but concise introduction to introduce some ...

Equation 1) x² + y² = 25 Equation 2) y - 3x = 13 First you need to substitute a variable so there is only one unknown in the equation: 2) y = 13 + 3x Substituting this into equation ...

So first you need to multiply out the brackets so you can simplify the equation. Remember the acronym FOIL: First, Outer, Inner, Last.10w^2 + 35w - 12w - 42
And then you need to simplify
10w^2 +...

The alveoli are covered by a rich blood supply of capillaries- this provides a diffusion gradient for oxygen to move into the blood and carbon dioxide to move into the lungs.The alveoli are also highly fo...