Of course you always have to balance yourself when you are on a bike. That's easy when you are pedaling but harder when you are stopped. When you are pedaling, the wheels are spinning. That makes your bike a gyroscope. A wheel spinning in an upright position tends to keep that position. That same idea also works for other things. You may have noticed that a spinning top falls over when it stops spinning. Which best describes the main idea of the passage?

The height of a birch tree, f(x), in inches, after x months is shown in the graph below. how much does the birch tree grow per month, and what will be the height of the birch tree after 10 months? a. the birch tree grows 1 inch per month. the height of the birch tree will be 16 inches after 10 months. b. the birch tree grows 2 inches per month. the height of the birch tree will be 26 inches after 10 months. c. the birch tree grows 3 inches per month. the height of the birch tree will be 36 inches after 10 months. d. the birch tree grows 2 inches per month. the height of the birch tree will be 24 inches after 10 months.