It helps on the SAT to be comfortable with parabolas, and I certainly recommend that, before you take the test, you practice identifying the zeros and the coordinates of the vertex of a parabola. But if you draw a blank, all is not lost. Remember that a parabola is just a function in which one value depends on another. So just as you can plug answer choices into an equation to find solutions, you can often work backwards into the solution on parabola problems.