Which relation is a function?

a.
{–2, 10), (–6, 10), (–2, 3)}

b.
{(0, 3), (0, 9), (12, –4)}

c.
{(5, 5), (5, 9), (5, 15)}

d.
{(–5, 1), (4, 9), (6, 10)}

Anthony is making a collage for his art class my picking shapes randomly. he has five squares, two triangles, two ovals, and four circles. find p( circle is chosen first)

What is the 12th term of b(n)=-4-2(n-1)

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.