Maths, Optimisation, Calculus, Numerical Methods, Differential Equations.
not close enough 2.45? 6.0025, wow that is quite close to six. We can in most cases stop there and declare that the square root of 6 is roughly 2.45. But in some cases, we will need it to be more precise, so that we can work out the exact amount that our boat will need to weigh to carry 4 people