Help I really need help

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)

The owners of four companies competing for a contract are shown in the table below. if a report is released that advocates company b, which of the people having funded the report should result in the most skepticism? company owner of company company a jake adams company b company c company d debby smith henry rose rhonda baker o a. jake adams o b. rhonda baker o c. debby smith o d. henry rose