Triangle RST is rotated 90 degrees from the point (1,-1). What are the new coordinates of the point T prime

In the image, point a marks the center of the circle. which two lengths must form a ratio of 1 : 2? (options are in the images since thought they were harmful phrases)

Two lines parallel to the same plane are parallel to eachother

Which of these sequences is a geometric sequence a 1,2,4, 7, 11, 16, 22. b. 2.4.8.14.22.38 c.3.6.9. 15.18,21 d. 3,9,27,81,243,729,