An oven's heating element turns on when the internal temperature falls to 15 degrees below the set temperature and turns off when the temperature reaches 5 degrees above the set temperature. You preheat the oven to 345 degrees before putting a cake in and baking it for an hour at 345. Write an inequality in terms of the temperature, $T$, that describes the temperature range of the oven while the cake is baking.

help (inequalities)