Hi all,
An update on the Unit 1 Chapter 1 assessment.
What we said we’d do: swap out the hex questions for others more directly related to material in lessons 17.
Why we’re not going to what we said:
Because some (many) students have already taken the test with the hex questions, and some (many) more teachers have visited or previewed the old version of the test, they are all effectively “locked in” to the old version.
While there are several way we could change the question under the hood, all lead to one or more nasty scenarios that we don’t have engineering solutions to mitigate for right now. For example:

for students who have already taken the test it would suddenly appear to both their teacher and themselves that they have NOT have taken it, and have questions left blank.

teachers who previewed the version with hex questions could not see the new versions of the questions under their normal teacher account, even though their students, upon visiting the test for the first time, would. This would lead to situations where students might see a different version of the test than the teacher previewed. And also no way for the teacher to know which question the student answered without individually inspecting each student.

Multisection classes in limbo between versions of the test.

Etc.
So, we apologize for the confusion, and for having hex questions (accidentally) in there in the first place. Our solution for the time being has been to insert the following preamble prior to the hex questions.
The next question refers to hexadecimal which is a base16 number system  a number
system that uses one of 16 possible digits for each place value. You may not have
explicitly covered hexadecimal in your class yet, that's okay. Consider this a
challenge question and try your best using your intuition about what you already know.
The 16 digits used in hexadecimal are: 0 1 2 3 4 5 6 7 8 9 A B C D E F. These
represent the decimal values 015, respectively. Hex is just another number
system so, for example the value "fourteen" can be represented in
Decimal, Binary and Hexadecimal like so:
Decimal: 14
Binary: 1110
Hexadecimal: E
Hopefully, this mitigates things slightly and as teaching strategy you can investigate the answers with your students. Converting 0x56 to decimal for question 9 is a toughy, but fits the pattern of all number systems once you know place values. There is a 5 in the 16s place and 6 in the ones place so…
5x16 + 6x1 = 86