Which relation is a function?

a.
(6, 5), (1, 1), (6, 4)

b.
(0, 1), (2, 3), (2, 5)

c.
(8, –2), (–2, 5), (6, 0)

d.
(–2, 3), (–5, 9), (–5, 3)

Aculture started with 3000 bacteria. after 5 hours it grew to 3900 bacteria. predict how many bacteria will be present after 9 hours

Solve 2x2 + 8 = 0 by graphing the related function. there are two solutions: . there are no real number solutions. there are two solutions: 2 and -2

The radius of a sphere is 3 inches. which represents the volume of the sphere?