Final answer:
The additional electoral college votes needed by Candidate X to win the election is 115, which is calculated by subtracting their current votes (155) from the required 270 votes.
Step-by-step explanation:
A presidential candidate needs at least 270 electoral college votes to win the election. If Candidate X currently has 155 electoral college votes, the number of additional votes they need is the difference between the required majority and what they currently have. Therefore, the correct calculation is Option 1: v = 270 - 155. This is a straightforward subtraction problem.