The most common size of trees in a grove is half the maximum of 20 feet. What is the typical amount that trees deviate from this most common size?

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

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.)

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.