Hi Ionu? Toma,
Sorry for not replying sooner. This support request somehow missed my attention!
Can you further explain what you are trying to do? Are you trying to add those expressions to the question, or to the answers? Are you asking why typing 10^8 is not converting to a real number?
One thing that can always be done is that you can use HD Quiz’s image feature to add custom characters that are not “web-safe” – characters that WordPress changes or converts for security purposes. So you add the needed text in an image and upload as the featured image for the question or do the same with the “images as anaswers” feature.