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Capital expenditure appraisal is the evaluation of investment opportunities. 

1. Payback method = The payback method involves calculating the payback per...

The equation is 2πr.  That is 2 x pi x the radius (not the diameter!)

There are two situations when you can use an apostrophe:  contractions and for possession.  I will start with contractions as this is the easiest.

A contraction is when you...

The fluid mosaic model describes the composition and function of cell membranes.  Membranes are made of lipids and proteins (and a few other bits and bobs but don’t worry about that here).  The lipids ...

A gene is a segment of DNA that carries the instructions for a specific trait, such as eye colour or how well you can digest food.  When DNA is damaged or is copied incorrectly this changes the gene an...