Hi Ken,
That tutorial is part of Dave Wolber’s materials, as Peter points out in his reply. App Inventor took ownership of the appinventor.org in June 2026 previously supported at UCSF (see https://www.appinventor.org/appinventorusf for background). The textbook and related resources were originally published in 2014 and App Inventor is no longer supporting them on our website. We encourage you to refer to https://www.appinventor.org/curriculum for our up-to-date curricula. The original website is available on the Archive.org WaybackMachine in a 2020 snapshot at https://web.archive.org/web/20200801105801/appinventor.org/.
If you are looking for an updated Quiz app, this one I made for Technovation Girls. It doesn’t include images but it goes over making a simple quiz in App Inventor.