Final answer:
To create the linear arrangement with R ahead of Q separated by four spaces, place R and Q on a line with four dashes between them, like this: R - - - - Q.
Step-by-step explanation:
To draw the linear arrangement where R and Q are separated by four spaces with R being ahead of Q, you need to represent this on a line. If we consider that each space is represented by a dash (-), and we denote R and Q with their respective letters, a possible arrangement could look like this:
R - - - - Q
Here, R is ahead of Q, and there are exactly four spaces between them, fulfilling the criteria of the question.