What is the plural of the word formula [duplicate]

Solution 1:

It appears that the plural formulas has become the most common term also in scientific context:

for·mu·la /ˈfɔːmjʊlə/: - n. pl. for·mu·las or for·mu·lae.

Usage note:

• The word formula has two possible plural forms, formulae and formulas. The traditional distinction is that formulas should be used in general writing and formulae in mathematical and scientific contexts, but analysis of the Oxford English Corpus shows that formulas is increasingly the dominant form in both technical and general uses. (ODO)

Ngram and Ngram: the graphs suggest that the most common use is 'formulas'.