"The pasta is short."
(Note: I'm learning too, but I'm ahead of you). The reason is because both words have the hey ה attached. So it's "the short pasta." If it was only attached to pasta, then it's "the pasta is short." This is in the tips and notes. Do you need them?
THE SHORT PASTA: הפסטה הקצרה
THE PASTA IS SHORT: הפסטה קצרה
how to get tips and notes:
organized by skill in one pdf for the whole course: https://www.docdroid.net/JnfmyEV/tipsnotesbackup.pdf
( my favorite way ) Replace your username where USERNAME is for information on your progress & the tips & notes: https://duome.eu/USERNAME/progress
The whole course tips and notes are here (and the site has one for each Duolingo language), organized by skill: http://duolingo.wikia.com/wiki/Hebrew
You can also get them on the duolingo.com site [make sure your browser is in desktop view mode so you can see the other duolingo features like discussions & timed practice (the language clubs are only on the app though)]. From discussions you can search for all the discussions in this course (like this one you're reading, as well as see general duolingo discussions). If you can't see discussions on the main screen once logged into duolingo you're not in desktop view.