Solve for b and x and show work

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

In the diagram, be and ad pass throughthe center of circle o, and the area ofsector aoc is 47.45 square units. what isthe area of sector boc? use the value =3.14, and round your answer to two decimalplaces.22.33 square units25.12 square units