I was cooking a food

Add or subtract polynomial : –12qr? +13rq?

Brian, chris, and damien took a math test that had 20 questions. the number of questions brian got right is 14 more than the number of questions chris got right. damien correctly answered 2 less than the number of questions chris answered correctly. if brian and damien have the same score, which statement is true?

Which math sentence can be used to determine if the triangle is a right triangle?