I need help with this

After applying the composition r0.90 ry to rs what are the coordinates of r' and s'? a.r'(–3, 1),  s'(–3, 5)b.r'(–1, 3),  s'(–5, 3)c.r'(1, 3),  s'(5, 3)d.r'(5, 3),  s'(1, 3)

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Three times the sum of a number and seven is negative thirty-six. what is the number?