Find the domain of the relation {(–4, –1), (–2, 1), (0, 1), (2, 3), (4, 0)}
answers:
a: {–1, 0, 1, 3}
b: {–4, 0, 2, 4}
c: {–4, –2, 0, 2, 4}
d: {–4, –2, –1, 0, 1, 2, 3, 4}

Michael gose to a theme park and rides two different roller coasters that both begin on a raised platform his height while on the first roller coaster measured in feet from the platform height can be modeled by the following graph where t is the number of seconds since the ride began