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There are many sources of copyright free images. The above images (and many more) were returned as a result of searching Wylio for polyhedron. This Diigo list (clicking on the green links takes you direct to each website) has several sites which can be searched for copyright free images."

Highlights of Calculus is a series of short videos that introduces the basic ideas of calculus - how it works and why it is important. The intended audience is high school students, college students, or anyone who might need help understanding the subject. In addition to the videos, there are summary slides and practice problems complete with an audio narration by Professor Strang. You can find these resources to the right of each video.

FREE TO USE learning resources that you can use to supplement your own course materials or learning. Some of these are from BC-based projects while others are from Open Educational Resource projects from around the world."

A second degree polynomial function can be defined like this

Links to free statistics software, online statistics books, tutorials, downloadable software, and related resources. Selecting the right kind of analysis; online software package websites; calculators, plotters, function integrators, and interactive programming environments; probability distribution functions, such as tables, graphs, and random number generators; descriptive statistics, histograms, and charts; confidence intervals and single-population tests; sample comparisons, such as T-tests, ANOVAs, and non-parametric comparisons; contingency tables,

"Variance describes, mathematically, how close the observations in a data set (data points) are to the middle of the distribution. Using the mean as the measure of the middle of the distribution, the variance is defined as the average squared difference of each data point from the mean of the data. Standard deviation, the square root of the variance, is the average distance of the data points from the mean. "

"Khan Academy is 100% OER and is moving toward long-term sustainability, having achieved short-term through grants. It actually has a group of people translating, which you can join, as long as the results are OER too: "

"Art of Problem Solving is a larger community (closer to 50k people) with a similar model: http://www.artofproblemsolving.com/ - they already have multiple authors, but they don't provide this as an "author service" so to speak, as O'Reilly does in some ways. "

"Experience Geometry on your desktop and on the web Easily create startling geometric constructions! Starting from simple triangle relations, continuing with trigonometric theorems up to fractals and transformation groups Cinderella lets you create and manipulate visualizations in an intuitive, yet powerful way."

"Here there are 72 ideas to look for science, mathematics or technology in your city … You can use any of our proposals, or you can keep looking for new ideas … There are millions of possibilities, just go out and start looking at the city with critical eyes, curiosity and willing to search for science phenomena"

"share colloquial statements that encode (in a non-rigorous way, of course) some nontrivial mathematical fact (or heuristic). "

number sequence, agility

"free access to more than 600 items. The items: * Are appropriate for middle and early high school students. * Test student understanding in the earth, life, physical sciences, and the nature of science. * Test for common misconceptions as well as correct ideas."

"occasional high-level excursions, humorous observations, rants, and musings. The main-line exposition should be accessible to the "Generally Interested Lay Audience", as long as you trace the links back towards the basics."

A Mathematician's Lament by Paul Lockhart musician wakes from a terrible nightmare. In his dream he finds himself in a society where music education has been made mandatory. "We are helping our students become more competitive in an increasingly sound-filled world." Educators, school systems, and the state are put in charge of this vital project. Studies are commissioned, committees are formed, and decisions are made- all without the advice or participation of a single working musician or composer.

"After watching my youngest son take apart radios and cars, after watching the videotape of Crick and Watson building a model of the DNA molecule and receiving a Nobel prize for that, I realized that young people need those kinds of experiences as they get older, and in mathematics as well! And much attention here is paid to patterns and graphing everything! And doing things more than one way."

limited content, same idea as Kahn Academy

" Desmos Calculator! Use this calculator for graphing, for calculating, for sharing, for creating. Look on the right for help or inspiration. "

MathPickle is a site for K-12 teachers. Here, you can get problems that engage a wide spectrum of student ability.