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# Reference Material

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$$\textit{Introduction:}$$

Hello! You have reached the “Reference Material” page. This page is a list posts that have explained things well and are good to look back at for future posts and for reference material.

I redid this to try to make it easier to access/refer back to. Here is the original post by Melody: http://web2.0calc.com/questions/information-pages-worth-keeping-or-developing

This page is broken down into different sections as to try to make it easier to refer back to. For the most part, the topics are organized by “grade levels” of mathematics (like Algebra, Trigonometry, Calculus, etc.)

Remember, good manners are always important and very much appreciated!

http://web2.0calc.com/questions/good-manners-are-always-important_2

Without further a due, let’s dive right  in!

$$\textit{\mathbf{Various calculators and math resources:}}$$

Using the web2 calc:

• How to use the web2 calc for different things in physics like electron mass/atomic mass:

http://web2.0calc.com/questions/new-calculator-option

• Converting measurements on the web2 calc, two different methods:

http://web2.0calc.com/questions/how-to-convert-486mm-to-m#r2

http://web2.0calc.com/questions/1505-91-convert-unit-of-measurement#r2

• Absolute values on the web2 calc:

http://web2.0calc.com/questions/how-do-you-do-an-absolute-value

Calculator for linear regression (suggested by Alan)

http://www.alcula.com/calculators/statistics/linear-regression

Make a graph! (recommended by Melody and CPhill)

https://www.desmos.com/calculator

Great math materials/explanations:

http://www.mathsisfun.com/

Conversion web page:

http://www.convert-me.com/en/convert/volume/

GeoGebra, math software and tons of math materials!

http://www.geogebra.org/cms/en/

$$\textit{Basic math concepts:}$$

The good ol' times tables:

http://web2.0calc.com/questions/is-there-a-fix-way-where-i-can-memorize-the-time-table-from-1-to-12-time-table

Postive and negative numbers:

http://web2.0calc.com/questions/positive-and-negative-numbers-directed-numbers

Addition and subtraction of direct numbers:

http://web2.0calc.com/questions/it-just-doesn-t-make-sense-to-me

Dividing whole numbers by fractions:

http://web2.0calc.com/questions/dividing-whole-numbers-by-fractions

How to type in a fractions on this calculator:

http://web2.0calc.com/questions/how-do-i-type-in-fractions#r2

What happens when you divide by zero?

http://web2.0calc.com/questions/what-happens-when-you-divide-by-zero

Estimating square roots with the Newton method:

http://web2.0calc.com/questions/hi-i-want-to-know-how-to-solve-somthing-like-nbsp#r1

Square root in answer verses introduced square root.

OEIS (On-line encyclopedia of Integer sequences) Can’t find a pattern between a few numbers? Try out this website!

http://oeis.org/

$$\textit{Algebra:}$$

Solving a more difficult algebra problem:

http://web2.0calc.com/questions/solve-for-x-x-6-5-x

A page explaining how to solve inequalities:

http://www.mathsisfun.com/algebra/inequality-solving.html

Youtube clip explaining how to factor trinomials using the grouping method:

Graphing log functions on the web2 calculator:

http://web2.0calc.com/questions/how-do-you-insert-log-into-the-graph-on-this-website

Negative indices and negative exponets (a great explanation by Melody)

http://web2.0calc.com/questions/indices-especially-negative-indices

Advanced Algebra - Example of Remainder Theorem with full explanation.

Domain and Range - Exponential Functions
http://web2.0calc.com/questions/would-i-be-able-to-get-the-domainand-range-from-a-function-or-does-it-have-to-be-from-a-graph

$$\textit{Geometry:}$$

Understanding conics, focus, directric, etc, with interactive graphing:

http://www.intmath.com/plane-analytic-geometry/4-parabola.php

Angle with degrees, minutes, and seconds:

http://web2.0calc.com/questions/hey-i-need-to-find-a-side-of-a-triangle-but-the-angle-is-using-degrees-minutes-seconds-and-your-calculator-does-not-do-them

Segment of a circle:

http://web2.0calc.com/questions/how-do-i-find-the-length-of-a-segment-of-a-circle#r2

Surface area of a cylinder:

http://web2.0calc.com/questions/what-is-the-surface-are-of-a-cylinder-with-r-8-h-4#r1

A YouTube clip that shows measuring volume using displacement:

Some discussions/explainations of pi:

http://web2.0calc.com/questions/what-is-the-value-of-pi#r1

$$\textit{Probability and statistics:}$$

$$\textit{Trigonometry:}$$

Inverse trig on the web2 calculator:

http://web2.0calc.com/questions/how-can-i-put-tan-minus-in-the-calculator

How do you choose the correct trigonometric ratio (sin, cos or tan) to use?

Graphing complicated trig functions:

http://web2.0calc.com/questions/graphing-trig-functions_1#rr2

http://web2.0calc.com/questions/can-anyone-remember-the-formulas-of-period-phase-shift-and-range-of-the-sin-function#r5

$$\textit{Calculus:}$$

Introductory calculus:

http://web2.0calc.com/questions/determine-the-average-rate-of-change-of-the-function-between-the-given-values-of-the-variable_1#r1

Problem chain rule question.
http://web2.0calc.com/questions/a-street-light-is-on-top-of-a-6m-pole

$$\textit{Misc:}$$

What time is it around the globe?

http://web2.0calc.com/questions/world-time-map

Information for new people:

http://web2.0calc.com/questions/information-for-new-people

$$\textit{Website tips/tricks:}$$

One of reinout_g's tricks:

http://web2.0calc.com/questions/found-something-that-makes-life-a-lot-easier

How do I upload an image?

Searching with keywords:

http://web2.0calc.com/questions/how-to-search-use-keywords-to-find-what-you-want

LaTex (a format that can be used when answering questions on this forum) This can be confusing when you first look at it. Here’s some posts on how to use LaTex:

http://web2.0calc.com/questions/test_6

http://web2.0calc.com/questions/latex

$$\textit{The "fun" section!}$$

Here's some funner links/topics to finish up the post.

A math-game website:

http://www.cut-the-knot.org/

Why math is so hard:

http://web2.0calc.com/questions/why-does-math-have-to-be-hard-i-wish-it-was-slightly-simpler-and-then-i-would-love-math-i-do-like-math-though

http://web2.0calc.com/questions/why-is-math-so-hard#r10239

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good, ninja. i like reading them.

it is like my newspaper.

i need more of these!

They are so intersting!