From your own experience, and the pictures, answer the following questions.
1. Each time a pedal goes all the way around, which gearset--the front or the rear--
goes around once?
2. When the rear wheel goes around once, which gear set--the front or the rear--
goes around once?
3. If a bicycle has 2 gears in the front, and 5 in the rear, how many different
combinations of gears are possible? Justify your answer.