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 …

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Evaluating expressions with multiple variables: fractions & decimals Evaluating expressions with variables word problems Factor with the distributive property (no variables)

The goal of solving a linear equation is to find the value of a variable; we isolate the variable step by step until only the variable is on one side of the equation and only a constant is on the other.

Jessica explains how to use variables to hold on to a value to use later. Variables are an important part of programming, so pay close attention!

Unit 6: Two-variable inequalities Checking solutions of two-variable inequalities Constraining solutions of two-variable inequalities Graphing two-variable inequalities Modeling with linear inequalities

A random variable is some outcome from a chance process, like how many heads will occur in a series of 20 flips, or how many seconds it took someone to read this sentence. Calculate probabilities and …

Random variables can be any outcomes from some chance process, like how many heads will occur in a series of 20 flips of a coin. We calculate probabilities of random variables and calculate expected …