This isn't actually a math question I just wanted to know how do you become a tutor on here. ​

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

Which of these angles are complementary? a. 45o and 45o b. 63o and 117o c. 45o and 135o d. 90o and 45o

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.