How do you solve 3.2^2-[(9×2)+9]×(1/3)^2

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 are the solutions of the following system? y=-2x^2 y=x-2

What is the surface area of a cube with the volume of 729 ft?