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Lesson 2: Introduction to variables. What is a variable? Why aren't we using the multiplication sign? Creativity break: Why is creativity important in STEM jobs? Evaluating an expression with one variable.
A variable is a symbol that represents a value, often one that changes, like how long you've been awake. Learn ways that we can change an expression's value (such as by changing the values of its variables) or keep the value the same (such as with the distributive property).
Overview and history of algebra: Algebra foundations Introduction to variables: Algebra foundations Substitution and evaluating expressions: Algebra foundations. Combining like terms: Algebra foundations Introduction to equivalent expressions: Algebra foundations Division by zero: Algebra foundations.
In algebra, we use variables like x, y, and z to represent unknown values. Expressions are combinations of variables and numbers, while equations equate two expressions. Variables can take on different values depending on the context, and we can evaluate expressions by substituting values for the variables. Created by Sal Khan.
The Mathematics 3 course, often taught in the 11th grade, covers Polynomials; Logarithms; Transformations of functions; an extension of the worlds of Equations and Modeling; Trigonometric functions; Rational functions; and an extension of the world of Statistics and Probability.
The number of questions you get right is the independent variable, and that's driving the number of points you score. So the number of points you score is the dependent variable. And typically, the convention is to have the dependent variable be equal to some expression involving the independent variable.
Basic idea and definitions of random variables If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.
Equations with variables on both sides: decimals & fractions Get 3 of 4 questions to level up!
Math: Get ready courses; Get ready for 3rd grade; Get ready for 4th grade; Get ready for 5th grade; Get ready for 6th grade; Get ready for 7th grade; Get ready for 8th grade
Introduction to multivariable calculus: Thinking about multivariable functions Vectors and matrices: Thinking about multivariable functions Visualizing scalar-valued functions: Thinking about multivariable functions.