Simplify: (3x ² - 8xy + y ² ) - (7x ²- 4xy - 5y ²)
A: -4x ² - 4xy + 6y ²
B: -4x ² +4xy + 4y ²
C: -4x ² + 12xy - 4y ²
D: -4x ² - 12xy + 6y ²

Which number produces a rationale number when multiplied by 1/5

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.

Marina baked cookies. she gave 3/4 of the cookies to the scout bake sale. she shared the remaining 6 cookies with her friends. how many cookies did marina bake?