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New videos from Khan Academy 2019-08-13T17:04:41.462983
Aggiornato: 1 ora 46 min fa

Intro to creating worlds

Mar, 2019-07-30 00:01
Introduction to our lesson on creating worlds. Copyright The Walt Disney Company.

Materials

Mar, 2019-07-30 00:01
How we think about the materials used inside a land. Copyright The Walt Disney Company.

Costumes

Mar, 2019-07-30 00:01
Overview of costume design. Copyright The Walt Disney Company.

Failure of Reconstruction

Ven, 2019-07-26 17:22
During Reconstruction, three new amendments to the Constitution redefined freedom, citizenship, and democracy in the United States. But how much really changed? In this video, Kim examines continuity and change over time in the lives of African Americans in the South before and after Reconstruction.

The Mexican-American War

Ven, 2019-07-26 17:22
What were the causes and effects of the Mexican-American War? In this video, Kim discusses how Manifest Destiny and the annexation of Texas brought on the war, as well as how the war affected US politics and the existing residents of the Mexican Cession.

Dividing polynomials by x (no remainders)

Gio, 2019-07-25 13:24
Finding the quotient (x⁴-2x³+5x)/x is the same as asking "what should we multiply by x to get x⁴-2x³+5x?" We can do this in two ways, which will become useful as we solve more challenging problems.

Even and odd functions: find the mistake

Gio, 2019-07-25 13:24
See another student's work when trying to determine whether a function is even, odd, or either, and decide whether they made a mistake, and if so, where.

Reflecting functions: examples

Gio, 2019-07-25 13:24
We can reflect the graph of any function f about the x-axis by graphing y=-f(x) and we can reflect it about the y-axis by graphing y=f(-x). We can even reflect it about both axes by graphing y=-f(-x). See how this is applied to solve various problems.

Reflecting functions introduction

Gio, 2019-07-25 13:24
We can reflect the graph of y=f(x) over the x-axis by graphing y=-f(x) and over the y-axis by graphing y=f(-x). See this in action and understand why it happens.

Extraneous solutions

Gio, 2019-07-25 13:24
Extraneous solutions are values that we get when solving equations that aren't really solutions to the equation. In this video, we explain how and why we get extraneous solutions, by understanding the logic behind the process of solving equations.

Solving equations by graphing: graphing calculator

Gio, 2019-07-25 13:24
We can approximate the solutions to any equation by graphing both sides of the equation and looking for intersection points. If we have a graphing calculator, we can get a very good approximation of the solution.

Solving equations by graphing: intro

Gio, 2019-07-25 13:24
Some equations are hard to solve exactly with algebraic tools. We can always solve an equation by graphing it, although the solution might not be exact. This is an example of how to solve a relatively simple equation graphically.

Shifting functions introduction

Gio, 2019-07-25 13:24
The graph of y=f(x)+k (where k is a real number) is the same as the graph of y=f(x) only it's shifted up (when k>0) or down (when k<0). Similarly, the graph of y=f(x-h) (where h is a real number) is the same as the graph of y=f(x) only it's shifted to the right (when h>0) or to the left (when h<0)

Scaling functions horizontally: examples

Gio, 2019-07-25 13:24
The function f(k⋅x) is a horizontal scaling of f. See multiple examples of how we relate the two functions and their graphs, and determine the value of k.

Even and odd functions: tables

Gio, 2019-07-25 13:24
Even functions are symmetrical about the y-axis: f(x)=f(-x). Odd functions are symmetrical about the x- and y-axis: f(x)=-f(-x). Let's use these definitions to determine if a function given as a table is even, odd, or neither.

Scaling functions introduction

Gio, 2019-07-25 13:24
The graph y=k⋅f(x) (where k is a real number) is similar to the graph y=f(x), but each point's distance from the x-axis is multiplied by k. A similar thing happens when we graph y=f(k⋅x), only now the distance from the y-axis changes. These operations are called "scaling."

Graphing square and cube root functions

Gio, 2019-07-25 13:24
We can graph various square root and cube root functions by thinking of them as transformations of the parent graphs y=√x and y=∛x.

Even and odd functions: equations

Gio, 2019-07-25 13:24
When we are given the equation of a function f(x), we can check whether the function is even, odd, or neither by evaluating f(-x). If we get an expression that is equivalent to f(x), we have an even function; if we get an expression that is equivalent to -f(x), we have an odd function; and if neither happens, it is neither!

Solving equations by graphing: word problems

Gio, 2019-07-25 13:24
We can approximate the solutions of any equation by graphing both sides of the equation and looking for intersection point. See how we apply this idea to solve some word problems.

The City at night, Joseph Stella's The Voice of the City of New York Interpreted

Gio, 2019-07-25 03:49
Joseph Stella, The Voice of the City of New York Interpreted, 1920-22, oil and tempera on canvas (five panels), 99.75 x 270 inches overall (Purchase 1937 Felix Fuld Bequest Fund 37.288a-e, Newark Museum), a Seeing America video Speakers: Dr. Tricia Laughlin Bloom, Curator of American Art, Newark Museum and Dr. Steven Zucker

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