Here's an extract from Imran's (4RN) piece on Algebra:

There are five types of algebra: elementary, abstract, advanced, commutative, and linear. Algebra 1, typically taught in years 7-9, is elementary Algebra. Pre-calculus is a higher level of math. Algebra, invented by Muhammad ibn Musa al-Khwarizm and named after his book Kitab al-Jabr, comes from an Arabic word meaning 'restoration' or 'completion.' Algebra describes relationships between variables and is used in everyday life, such as measuring ingredients for a recipe. It is essential for mathematicians, computer programmers, engineers, data analysts, and maths teachers.