The questions in this section address a number of important math concepts. Most questions are multiple-choice with four answer choices. For each question, select the best answer from the choices given. You may use any available space in your test booklet or scratch paper to work out solutions. A calculator is permitted for all questions in this section — click Calculator above to open the graphing calculator. Selecting an answer will immediately reveal whether it is correct, along with a full explanation, so you can study independently. Unless otherwise indicated, all variables and expressions represent real numbers.