t will be helpful to break down the definition of a function given in the introduction:

"A rule" just means that we always do it the same way: If Susan's favorite color is red, then FavoriteColor$($Susan$)$ will always equal red.

"Relating each object in one set" just means that the rule gives us something for everything in the domain: Every student has a favorite color.

$"$To one, and only one, object in another set" means that when you apply a function to some object you only get one object in return: Zach's favorite color can be any color, but it cannot be two different colors.

$($Figure $1)$ shows the actions of the function FavoriteColor $($i$.$e$.,$ the arrows indicate which color each person is related to$).$

Part A

What is the value of FavoriteColor$($Troy$)?$

green

red

magenta

cyan

blue

yellow