Khan Academy: Variables and Expressions: Evaluate a Formula Using Substitution

In this substitution and evaluation learning exercise, students solve and complete 22 different problems that include using the substitution method of variables. First, they evaluate each expression for the given variable. Then, students...

This video demonstrates how to evaluate an expression with two variables using substitution.

Video evaluating an exponential expression using the order of operations.

A video that demonstrates how to substitute variables in order to evaluate a formula. The formula is given in the example. [1:15]

This video demonstrates how to solve a word problem using an expression and substituting values for a variable.

Video shows how to simplify the vector projection formula using unit vectors. Shows that projections are linear transformations. Shows the general formula for the transformation matrix for projections in R^2. Shows an example using the...

Video shows how to simplify the vector projection formula using unit vectors. Shows that projections are linear transformations. Shows the general formula for the transformation matrix for projections in R^2. Shows an example using the...

Video finding the volume of a cube with sides that are an algebraic expression involving exponents. [2:31]

Video first finding the square root of an integer and then working towards finding larger roots of numbers by utilizing fractional exponents and exponent rules. Highest root is the 6th root. Includes an example with a variable. Video is...

Explains how to solve a word problem regarding the amount of time it takes for a ball to hit the ground after being shot off a building by using the quadratic formula to find solutions to the given equation. [5:53]