Final answer:
The mention of 'RB' between specific values in a mathematical context requires understanding the full problem to determine the exact action needed. It's a conditional operation frequently seen in algebra or statistics at the high school level.
Step-by-step explanation:
The expression RB likely refers to a value or variable range in a mathematics context, particularly focused on high school level math. The statement 'If RB is between 130-137 you must' implies that there's a condition which requires action when RB falls within that specified range. This could be part of a function, an inequality, or a step in solving a problem where certain operations need to be performed if RB lies between those numbers.
Without additional information, it's not possible to provide the specific action required. However, this kind of conditional operation is common in algebra, where you might have to solve an equation differently based on the value of a variable, or in statistics where certain values might lead to different interpretations or actions.
It is essential to consult the full context of the problem to determine what action you must take when RB is between 130-137. Whether it involves plotting on a graph, solving an equation, or evaluating a function, understanding the complete problem will provide the necessary steps to proceed.