Can someone help me with this word problem

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Click on the graphic until you find the right quotient. (36xa - 30xb) ÷ (-6x2)

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?