London brought a tray of plants for $8.15 . There were 16 plants in the tray. if London only brought 1 plant about how much would it cost

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

Does the point (1, sqrt 7) lie on circle shown.

Can you me find the missing length. i attached an image.