I just took the chapter 5 Assessment for Intro to Networks. Question 20 asked me fill in the blank with the Hexadecimal representation of the Binary number 0000 1010. I answered with '0x0A'. To my surprise, I saw this question on my item feedback with the correct answer shown as '0A'; which is still correct.

However, I answered '0x0A' because I remembered reading in the chapter about how important it was to distinguish Hex from Decimal and it was done so by adding '0x' to the front of the Hex number (Chapter 5.1.3.1). I feel that if this is important enough to mention in the chapter, then that should be an accepted answer on the assessment as well.