Rachel solved 50 problems of her Homework correctly and scored 62.5%. How many problems were there in the Homework?
2 answers:
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The "inverse" operation of the distributibe property is factoring common terms: since the litera part is different for each term (we have a term involving x alone, a term involving y alone, and a pure number), we can only factor the numerical part.
4, 12 and 32 have factor 2 or 4 in common, so the two possible algebraic expression could be