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# Great answers to learn from (rough draft)

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Hey guys. Melody asked me to organize a thread for great answers that you could look back on and learn from. Here's what I have so far. I've called this a rough draft because if you guys would like anything changed up or have any sugestions, here's where your voice can be heard! After a little while, I will post a "final draft" with any sugestions or changes you guys have recomended.

By the way, I put some of Alan's answers about forces in a physics section. I'm not sure if this is the correct subject. Let me know if these should be put elsewhere. :)

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\$\$Introduction:\$\$

Hello! You have reached the "Great answers to learn from" page. This page is meant to be a collection of great answers that people could look back upon and learn from. Hopefully if you have a certain topic you want to learn about, you can some posts on that topic here!

For the most part, this thread is organized into "grade levels" of mathematics to make it easier to find what you want to learn about.

Finally, if you have anything you want to add to this post, go ahead and reply to it with what you want added, or you can message me and I'll add it to the proper section.

Roots and exponents:

http://web2.0calc.com/questions/can-anyone-do-square-roots

Dealing with time in math, on a handheld calculator! I liked Melody's explanation here:

http://web2.0calc.com/questions/what-is-21hours-and-58-minutes-subtracted-by-4-36-p-m-equal

Converting measurements on the web2.0 calc!

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

Variant of Average:

http://web2.0calc.com/questions/the-average-of-six-numbers-is-6-if-3-is-subtracted-from-each-of-four-of-the-numbers-what-is-the-new-average#r1

Forever repeating decimal!

http://web2.0calc.com/questions/0-99999

A drinking problem (puzzle)

http://web2.0calc.com/questions/a-drinking-problem

\$\$Algebra:\$\$

The basics of algebra:

http://web2.0calc.com/questions/solve-for-x-7

Some examples of solving a word problems with algebra:

http://web2.0calc.com/questions/you-want-to-place-a-towel-bar-that-is-8-1-4-inches-long-in-the-center-of-a-door-that-is-26-1-3-inches-long-how-far-should-you-place-the-bar

Three different techniques  to this answer dealing with polynomials:

http://web2.0calc.com/questions/5a-5-5a-5

Seemed like an easy problem, but anonymous came to the rescue! Goes to show that a seeming easy problem can be tricky sometimes too!

http://web2.0calc.com/questions/the-difference-between-twice-a-number-and-8-is-twenty-more-than-nine-times-the-number-find-the-number

Solveing a nonlinear inequality. This one looks like a parabola!

http://web2.0calc.com/questions/solve-the-nonlinear-inequality

Well explained by heureka:

http://web2.0calc.com/questions/5x-8-3x-3-whats-the-x

Heureka just being awesome:

http://web2.0calc.com/questions/solve-the-equation_1

An example of scientific notation:

http://web2.0calc.com/questions/if-i-have-1-5-trillion-us-dollars-and-wanted-to-divide-it-up-between-7-billion-people-the-world-s-population-how-much-would-each-person-g

A more complicated algebra question answered by Alan

http://web2.0calc.com/questions/x-2-xy-y-2-28-y-2-x-how-do-you-get-x-and-y

http://web2.0calc.com/questions/horizontal-asymptote-of-y-x-2-6x-3-x-3

\$\$Logarithms:\$\$

What is a logarithm? (thanks to anonymous)

http://www.mathsisfun.com/algebra/logarithms.html

Half life problem:

http://web2.0calc.com/questions/the-half-life-of-carbon-14-is-around-5700-years-find-the-of-the-original-carbon-14-that-remains-in-a-sample-after-1835-years-have-passed

This certainly looks like a more difficult logarithmic equation to me!

http://web2.0calc.com/questions/difficult-logarithmic-equation-without-a-calculator

\$\$Geometry:\$\$

Triangles! Great picture and explanation by CPhill

http://web2.0calc.com/questions/so-i-have-two-triangles-here-but-are-they-overlapping-i-can-t-draw-i-diagram-that-fits-the-discription-p-nbsp-does-anyone-have-a-suges

Height of a triangle, the Pythagorean theorem!

http://web2.0calc.com/questions/how-do-i-figure-out-the-right-of-a-triangle-when-ab-equals-13-and-cb-equals-12

Heron's formula to find the area of a triangle:

http://web2.0calc.com/questions/triangle-s-sides-are-a-5-b-12-and-c-9-what-is-the-area-of-the-triangle

Volume of a sphere:

http://web2.0calc.com/questions/a-spherical-ball-hss-a-diameter-of-45cm-workout-the-volume-of-the-ball

Wagons! Turning a word problem into an answer:

http://web2.0calc.com/questions/neeeed-help-on-this

\$\$Trigonometry:\$\$

Verifying the identity

http://web2.0calc.com/questions/verify-the-identity-cot-theta-sec-theta-csc-theta

Light rays!

http://web2.0calc.com/questions/if-a-light-ray-is-incident-of-the-glass-surface-with-index-of-refraction-n-1-50-at-0-degree-anglee-what-would-be-the-angle-of-refraction-if#r2

Velocities - Looks like a great answer from Alan:

Another trig. problem:

http://web2.0calc.com/questions/8-sec2-x-4-tan2-x-12-0

\$\$Calculus:\$\$

\$\$Physics:\$\$

Forces explained by Alan

http://web2.0calc.com/questions/finding-friction-coefficient-from-kinetic-energy

http://web2.0calc.com/questions/2d-forces-equation#r0

Vector forces:

http://web2.0calc.com/questions/collinear-resolving-angles-of-a-parallelogram

Jul 24, 2014

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Good selection NinjaDevo; and, yes, forces should be in Physics.

Jul 25, 2014

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Thats really nice NinjaDevo for doing this for all of us!i'd like to give u a thumbs up for this!

I'll surely let you know if i require something to be added out here!

Thanks!

Jul 24, 2014
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I love it, NinjaDevo. I wonder how long it took you to do it.

Jul 24, 2014
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Thank you Ninja, it looks great.

Jul 25, 2014
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Good selection NinjaDevo; and, yes, forces should be in Physics.

Alan Jul 25, 2014
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Hi Ninja,

I just thought I'd pop ideas in here but probably the best place to get more threads from would be my nightly wraps.  Anyway this is your baby so you can choose.   Thank you.

You may even already have them.

Growth and decay

Half Life

http://web2.0calc.com/questions/the-half-life-of-carbon-14-is-around-5700-years-find-the-of-the-original-carbon-14-that-remains-in-a-sample-after-1835-years-have-passed

Cooling Question: A really good advanced senior high one: Thanks Alan

This is probably a dumb idea - just take them from the Wraps if/when you want to.

Can't help myself - I am having a watchlist clearout!

Non-linear Inequalities  (this one looks really good)

http://web2.0calc.com/questions/solve-the-nonlinear-inequality

http://web2.0calc.com/questions/horizontal-asymptote-of-y-x-2-6x-3-x-3

What would you call this type or problem - sorry I don't know.  Ummm

http://web2.0calc.com/questions/a-drinking-problem

Jul 26, 2014
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Thanks everyone for the positive feedback. :)

Also, thanks Alan for making sure the physics posts were correctly placed.

Finally, I did add those links to the original post here Melody. They seemed like some nice additions.

Jul 28, 2014
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Thanks Ninja.

Jul 28, 2014