The plural of formula is formulae. A formula is a mathematical rule or relationship that uses letters to represent amounts which can be changed – these are called variables. For example, the formula ...

The questions in this quiz are suitable for GCSE maths students studying formulae, substitution, creating formulae, changing the subject of a formula, rearranging formulae - higher and function ...

PROF. F. W. GROVER, makes an authoritative selection among the numerous formulæ which have been suggested for the calculation of mutual and self inductances. He does not attempt proofs of the formulæ, ...