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  2. Grade (slope) - Wikipedia

    en.wikipedia.org/wiki/Grade_(slope)

    Grade is usually expressed as a percentage - converted to the angle α by taking the inverse tangent of the standard mathematical slope, which is rise / run or the grade / 100. If one looks at red numbers on the chart specifying grade, one can see the quirkiness of using the grade to specify slope; the numbers go from 0 for flat, to 100% at 45 ...

  3. Slope - Wikipedia

    en.wikipedia.org/wiki/Slope

    Slope illustrated for y = (3/2)x − 1.Click on to enlarge Slope of a line in coordinates system, from f(x) = −12x + 2 to f(x) = 12x + 2. The slope of a line in the plane containing the x and y axes is generally represented by the letter m, [5] and is defined as the change in the y coordinate divided by the corresponding change in the x coordinate, between two distinct points on the line.

  4. MathChallengers - Wikipedia

    en.wikipedia.org/wiki/MathChallengers

    Participants should be provided with ample amounts of scratch paper and pencil for calculating answers. For each questions the participants will be allowed to work for 45 seconds from the time it appears on the screen. A participant who wishes to provide an answer must buzz. But, only the first person who buzzes will be called to provide an answer.

  5. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  6. Third grade - Wikipedia

    en.wikipedia.org/wiki/Third_grade

    Third grade (also 3rd Grade or Grade 3) is the third year of formal or compulsory education. It is the third year of primary school . Children in third grade are usually 8–9 years old.

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  8. Naismith's rule - Wikipedia

    en.wikipedia.org/wiki/Naismith's_rule

    Naismith's rule helps with the planning of a walking or hiking expedition by calculating how long it will take to travel the intended route, including any extra time taken when walking uphill. This rule of thumb was devised by William W. Naismith, a Scottish mountaineer, in 1892. [1] [3] [4] A modern version can be formulated as follows:

  9. Hill sphere - Wikipedia

    en.wikipedia.org/wiki/Hill_sphere

    The Hill sphere is a common model for the calculation of a gravitational sphere of influence. It is the most commonly used model to calculate the spatial extent of gravitational influence of an astronomical body ( m ) in which it dominates over the gravitational influence of other bodies, particularly a primary ( M ). [ 1 ]