What is the geometric mean between 6 and 12?

Which point is a solution to the inequality shown in this graph (-3,-3)(3,-1)

The system of equations graphed below has how many solutions?

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning