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Maths I
Formulae
Mathematics is full of rules. In mathematics, another word for a rule is a formula. This section deals with constructing a formula, and using it to work out values. We shall also look at forming algebraic equations.
Remember BODMAS? It means we have to work out first, the bit inside brackets, if there are any. Division and multiplication are done before addition and subtraction.
A cashier used the formula below, to work out plumbers' wages.
where
Calculate the wages of a plumber whose normal working week is hours, and who worked hours in the evening, and hours on Saturday.
We are told , and .
Put these values into the formula:
Work inside the brackets first. Multiplication before addition
Therefore the wages are .
Use the formula to find the weekly wage of a plumber whose normal week is hours and who worked hours in the evening and hours on Saturday.
, ,
The wages are
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