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...seven states require students to pass three math courses before graduation from high school (grades 9 to 12, for students typically aged 14 to 18), while s ...f><ref>{{Cite book |last=Pickover |first=Clifford A. |title=The Math Book: From Pythagoras to the 57th Dimension, 250 Milestones in the History of Mathemat ...

...representing the Sun|Artist's concept of the [[Earth]] 5–7.5 billion years from now, when the [[Sun]] has become a [[red giant]]]] Long after the death of the Solar System, physicists expect that matter itself will eventually disintegrate under the influence ...

...r biology, active transport is the movement of molecules across a membrane from a region of their lower concentration to a region of their higher concentra ...'''[[Albedo]]'''}}{{defn|defn=A measure of the fraction of light reflected from an astronomical body or other object.}} ...