Ashley has decided to participate in sit-up challenge. The first day she will complete sit-ups. Every day she will do twice as many sit-ups as the day before. The function can be used to to determine how many sit-ups she will do on day x of the challenge.

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.