This piecewise function has five steps (or pieces). Look closely at the Boundary Points between pieces: x = 1 oz, x = 2 oz, x = 3 oz, x = 4 oz, etc. Will you pay a higher or lower rate if your item weighed exactly any of those amounts?
Notice that this piecewise function consists of five horizontal pieces. Recall that a horizontal line is of the form y = k, where k is a constant. Also, consider the boundary points: will ≤ or ≥ be appropriate?