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Unlike in the English past tense, the French have two auxiliary 'helping' verbs - avoir and être, these become before the past participle, e.g. descendu. For example, j'ai mangé, and je suis allé.
So...

Expand and simplify (5x – 2y)(3x – 4y)

In this question, we are asked to 'expand' out the brackets. What this means is we need each term in one set of brackets (5x and -2...

Coronary heart disease is an incredibly common disease.  

It involves the coronary arteries: the arteries which provide oxygenated blood to the heart tissue itself to keep it functioning....

To answer this we can start by breaking down the phrase itself.

So, 'myo' always means muscle. 'Cardial' means of the heart. So myocardial infarction means infarction of the heart muscle....