Final answer:
The statement 'Mara thinks (3 X x) is the highest score' is incomplete and cannot be categorized as true or false without further information or comparison.
Step-by-step explanation:
The statement 'Mara thinks (3 X x) is the highest score' is neither true nor false. It is incomplete as it does not provide any context or comparison. To determine if the statement is true or false, we need additional information or a specific comparison point. For example, if we compare (3 X x) to another score or an average score, we can evaluate if it is the highest or not.