Final answer:
Without specific values or a relationship between w and x, it is not possible to determine the smallest possible value of w - x. Additional context or numerical values would be required to calculate this difference.
Step-by-step explanation:
The question provided doesn't include enough information for us to determine the smallest possible value of w - x. To calculate w - x, we would need specific values or a relationship between w and x. In the additional information given, different contexts are provided where w holds a value of 100 feet in one scenario, and various equations are presented, none of which directly address the computation of w - x without further context or values for x.