Answer
a. $(Iceland,\ 9.7)$, $(Finland,\ 9.6)$, $(New\ Zealand,\ 9.6)$, and $(Denmark,\ 9.5)$.
b. function
c. $(9.7,Iceland)$, $(9.6,Finland)$, $(9.6,New\ Zealand)$, and $(9.5,Denmark)$.
d. not a function
Work Step by Step
a. We can write a set of four ordered pairs as
$(Iceland,\ 9.7)$, $(Finland,\ 9.6)$, $(New\ Zealand,\ 9.6)$, and $(Denmark,\ 9.5)$.
b. The relation in part (a) is a function because each value in the domain (country name) corresponds to only one value (rating).
c. We can write a set of four ordered pairs in the given format as
$(9.7,Iceland)$, $(9.6,Finland)$, $(9.6,New\ Zealand)$, and $(9.5,Denmark)$.
d. The relation in part (c) is not a function because the same value in the domain $(9.6)$ corresponds to more than one country name (Finland and New Zealand).
