HELP pls if you know this

Which shows the image of rectangle abcd after the rotation (x, y) → (–y, x)?

Your friend swims on the school team. in his first four races, his times are 24.7, 23.5, 25.6, and 27.2 seconds. which time listed for his next race would make the range larger?

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?