Which graph represents a function?

Given the following similar triangles what is the area of triangle b ? a) 1 b)1.8 c)3.2 d)5

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

Write an algebraic expression for the word expression the quotient of c and 8