Final Answer:
The initial value to find Valerie's distance from Houston when she starts to drive depends on the context provided in the question. Without specific details or values given, it is not possible to determine the exact initial distance.
Step-by-step explanation:
To find Valerie's distance from Houston at the beginning of her drive, you need information such as her starting point or any initial distance mentioned in the problem. Without this context, the question lacks the necessary details to calculate the initial value accurately. Distance is a relative measure, and it is crucial to know the reference point or starting position to calculate the initial value.
In conclusion, the question needs additional information to determine the initial value accurately. Therefore, the answer is context-dependent, and the appropriate option cannot be determined without further details.