The altitude at which we boil an egg affects how long it takes for the egg to achieve perfect hardness. It takes $198$ seconds to boil a perfect egg at the lowest place possible, the edge of the Dead Sea, which has an altitude of $-418$ meters. The highest place possible is the summit of Mount Everest which has an altitude of $8848$ meters. It takes $209$ seconds to boil a perfect egg there. $T(a)$ models the time (in seconds) it takes to boil a perfect egg at an altitude of $a$ meters. **Which number type is more appropriate for the domain of $T$?** [[☃ radio 1]] **What's the appropriate domain?** [[☃ radio 2]]