To define the quantity and scale for the x-axis of a piecewise linear graph representing the fee structure based on the dog's weight, we need to consider the following:
- The quantity that is being measured on the x-axis is the weight of the dog, as the fee structure is based on the dog's weight.
- The scale on the x-axis should be appropriate for the weight categories given (under 15 lbs, between 15 and 50 lbs, and 50 lbs or more). The smallest incremental weight that makes sense in this context is likely to be 1 lb, as we want to capture the changes in weight accurately within the specified ranges.
Therefore, the best response would be:
weight; 1