Rather than write x > 5 or -2 < x < 4, we're going to put the numbers in parentheses and brackets, like (2,6) or [-3,1). The only trick: whether to use ( )'s or [ ]'s or some combination of the two! You'll also have to learn how to draw the infinity symbol super-good (lol).
If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)