[size=150][size=200][color=#000000]Two approaches:[br][list][*]explicit (solving differential equations): Function.[br][/*][*][b]cumulative [/b](calculating step by step): Graph. [/*][/list][br]Four characteristic kinds of modelling growth:[br][list][*]linear[/*][*]exponential[/*][*]limited[/*][*]logistic[/*][/list][/color][/size][/size]