Algebra I on Khan Academy: Algebra is the language through which we describe patterns. Think of it as a shorthand, of sorts. As opposed to having to do something over and over again, algebra gives you a simple way to express that repetitive process. It’s also seen as a “gatekeeper” subject. Once you achieve an understanding of algebra, the higher-level math subjects become accessible to you. Without it, it’s impossible to move forward. It’s used by people with lots of different jobs, like carpentry, engineering, and fashion design. In these tutorials, we’ll cover a lot of ground. Some of the topics include linear equations, linear inequalities, linear functions, systems of equations, factoring expressions, quadratic expressions, exponents, functions, and ratios.

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Finnish explorer Kari “Ruffe” Nurmi was sailing around Svalbard with a small sailboat in summer 2013 when this amazing and hungry polar bear spotted their dinghy on shore. Polar bear became curious and probably tried to find some food from the dinghy. Unfortunately the dinghy was destroyed in the process but they managed to fix…

Uh-oh. GULP… word problems. They’re here, and not going away. Not to worry though, because Yay Math is here to shed some e-asy light on these logs, naturally. Too many math puns for comfort. But sincerely, the half-life problems, also involving exponential growth and exponential decay, can be very tricky. That’s why this video breaks…

Understanding the inverse cosine or arccos function Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/trigonometry/unit-circle-trig-func/inverse_trig_functions/e/inverse_trig_functions?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry Watch the next lesson: https://www.khanacademy.org/math/trigonometry/unit-circle-trig-func/inverse_trig_functions/v/inverse-trig-functions-arctan?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry Missed the previous lesson? https://www.khanacademy.org/math/trigonometry/unit-circle-trig-func/inverse_trig_functions/v/inverse-trig-functions-arcsin?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry Trigonometry on Khan Academy: Big, fancy word, right? Don’t be fooled. Looking at the prefix, tri-, you could probably assume that trigonometry (“trig” as it’s sometimes called) has something…