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KhanAcademyVideos

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New videos from Khan Academy 2019-07-09T00:01:20.663951
Atualizado: 1 hora 39 minutos atrás

Setting up a system of linear equations example (weight and price)

ter, 2019-07-09 00:01
Practice writing a system of linear equations that fits the constraints in a word problem.

Determining whether values are in domain of function

ter, 2019-07-09 00:01
Sal shows how to test whether or not a value is or isn't in the domain of a function.

Slope and y-intercept from equation

ter, 2019-07-09 00:01
Practice identifying the slope and y-intercept from a linear equation given in slope-intercept form — especially in equations that aren't obviously in slope-intercept form.

Finding slope and intercepts from tables

ter, 2019-07-09 00:01
Given a linear relationship in a table, practice finding the slope and intercepts.

Evaluating discrete functions

ter, 2019-07-09 00:01
Given the graph of a discrete function, Sal shows how to evaluate the function for a few different values.

Slope, x-intercept, y-intercept meaning in context

ter, 2019-07-09 00:01
Practice determining what each of the slope, x-intercept, and y-intercept represent in a given linear relationship.

Setting up a system of equations from context example (pet weights)

ter, 2019-07-09 00:01
Practice writing a system of linear equations that fits the constraints in a word problem.

Slope and intercept meaning in context

ter, 2019-07-09 00:01
Practice determining which feature of a linear model (the slope, the x-intercept, or the y-intercept) is useful for answering a given question in context.

Slope and intercept meaning from a table

ter, 2019-07-09 00:01
Given a linear relationship in a table, Sal graphs the relationship to explore what the slope and intercepts mean in the given context.

Constructing linear equations from context

ter, 2019-07-09 00:01
Given a written description of a linear relationship in a some context, write an equation that represents the linear relationship described.

Graphing a line given point and slope

ter, 2019-07-09 00:01
Practice graphing a line given its slope and a point the line passes through.

Examples finding the domain of functions

ter, 2019-07-09 00:01
Sal shows how to algebraically find the domain of a few different functions.

Interpreting points in context of graphs of systems

ter, 2019-07-09 00:01
Given a graph of a system of equations and a context, practice interpreting what various points represent in that system.

Calculating slope from tables

ter, 2019-07-09 00:01
Practice calculating the slope of a line given some points on the line shown in a table.

Clarifying standard form rules

ter, 2019-07-09 00:01
Clarifying standard form rules

Elimination strategies

ter, 2019-07-09 00:01
Practice identifying strategies for eliminating variables in a system of equations.

Economic growth through investment

qua, 2019-07-03 19:26
How investing for capital formation can expand the production possibilities curve

Labor-leisure tradeoff and the labor supply curve

qua, 2019-07-03 18:46
The basis of the labor supply curve is the tradeoff of labor and leisure. When wages increase, the opportunity cost of leisure increases and people supply more labor. Interestingly, this is not always the case! At higher wages, the marginal benefit of higher wages becomes lower and when it drops below the marginal benefit of leisure, people switch to more leisure and less labor. This leads to the rather unusual looking backward bending labor supply curve.

Rock Art in the Green Sahara

qua, 2019-07-03 03:23
The Sahara is the world's largest hot desert, spanning the entire northern part of Africa. Yet it hasn't always been dry -- archaeological and geological research shows that it has undergone major climatic changes over thousands of years. Rock art is one of the best records of the life of past peoples who lived across the Sahara. It often depicts extraordinary images of life, landscape and animals that show a time when the Sahara was much greener and wetter than it is now. To find out more, visit https://www.britishmuseum.org/africanrockart The African Rock Art Project is supported by Arcadia (https://www.arcadiafund.org.uk/) This film is in collaborative partnership with the Leverhulme Trust-funded project: “Peopling the Green Sahara. A multi-proxy approach to reconstructing the ecological and demographic history of the Saharan Holocene”, Paul Breeze, Nick Drake and Katie Manning, Department of Geography, King’s College London Modelling and mapping of the Green Sahara ©Kings College London Images ©Trust for African Rock Art (TARA)/David Coulson & ©Kings College London Animation and Motion Graphics by Soluis Heritage (http://www.soluis.com/)

The effect of interest rate changes in one country on currency values, the balance of payments, and exports.

seg, 2019-07-01 15:43
Changes in interest rates in one country impact economic conditions in other countries. In this video, walk through a chain of events that starts with a change in interest rates in the United States that affects the relative value of the dollar, the Japanese Yen, and exports.

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