Mary sold half of her comic books and then bought 9 more. she now has 14. how many did she begin with?

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?

What is the distance between the points 4,10 and -3,-14 on the coordinate plane

Which expression is equivalent to sq-80