the longest side of a triangle is a cm and the second side is b cm shorter than the first side and the third side is half the second side write an expression in its simplest form for the perimeter of the triangle

Which statement accurately explains whether a reflection over the y-axis and a 270° counterclockwise rotation would map figure acb onto itself? a coordinate plane with figure acb with point a at 1, 1, c at 3, 4 and b at 5, 1 yes, a″c″b″ is located at a″(1, 1), c″(4, 3), and b″(1, 5) yes, a″c″b′ is located at a″(1, 1), c″(3, 4), and b″(5, 1) no, a″c″b″ is located at a″(1, 1), c″(4, 3), and b″(1, 5) no, a″c″b″ is located at a″(1, 1), c″(3, 4), and b″(5, 1)

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Y+ 2/y is it a polynomial in one variable or not? and if so, why?