Mary is a scientist. Using a microscope, she looks at a salt crystal and discovers it is shaped like a cube. Each square face has side length 0.1 mm. Draw the crystal's square face such that 1 unit on the grid below represents 0.01 mm.

The inside wheels of a car traveling on a circular path are rotating half as fast as the outside wheels. the front two wheels are six feet apart. what is the number of feet in the path traced by the inside front wheel in one trip around the circle? express your answer in the form "k \pi", where k is an integer.

When only separate discreet points are graphed it is called?

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?