In a science experiment the temperature of a substance is changed from 42 °f to -54 °f at an average rate of -12 degrees per hour. over how many hours does the change take place? the answer is 8 hours i need the work for it though.

What is the approximate circumference of the circle shown below?

Arestaurant offers a $12 dinner special that has 5 choices for an appetizer, 12 choices for an entrée, and 4 choices for a dessert. how many different meals are available when you select an appetizer, an entrée, and a dessert? a meal can be chosen in nothing ways. (type a whole number.)

Una caja de galletas contiene 16 paquetes y cada una de estas tiene 12 galletas y se quieren repartir entre 6 niños ¿de cuantas galletas le toca a cada niño?