Watch this video to learn about the rules of surds. For example, \(\sqrt 4 = 2\) is not a surd. However \(\sqrt 5\) is a surd. If you use a calculator, you will see that \(\sqrt 5 = 2.236067977...\) ...

Depreciation refers to when the value of something goes down over time. Jack and Trisha bought a new car for £8500 in 2009. In the first year, its value depreciated by 20%, in the second year by 15% ...