63,825 in scientific notation

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?

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Graph y = -|x| + 2. click on the graph until the correct one appears.