Can someone help me please? :(

What is the approximate circumference of the circle shown below?

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian 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? i need this done

Find the area of the regular hexagon if a side is 20 cm.