For a complete guide on when to use simultaneous method in indices maths visit mathsrevision.net/gcse-maths-revision/algebra/simultaneous-equations
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Math (or maths) is not a job and so engineering does not use math as a job!Math (or maths) is not a job and so engineering does not use math as a job!Math (or maths) is not a job and so engineering does not use math as a job!Math (or maths) is not a job and so engineering does not use math as a job!
hair dressers use maths by making measurements in hair colour mix and cuting hair and the money!
Time series is a method of using past data to predict future values. It is based on the assumption that there is an undelying trend to the data. To predict future values, we use the concept of moving averages.
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This is a very short answer, but it tells you the basics. Maths is used in science; in science, you measure amounts. Maths is used in history; you use dates. Maths is also used in geography; in geography you count population and take measurements. Maths is used in music as well; you count the beats, multiply the beats and arrange them. There are many other uses of maths in these subjects, if you don't constrain yourself to thinking that maths is STRICTLY hard arithmetic and algebraic problems you will see that maths is in everything you do. From cooking, to breathing, maths is everywhere.