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Integer addition and subtraction: equations and number lines

Integer equations to describe diagram

Equivalent expressions with negative numbers

This example clarifies the purpose of order of operations: to have ONE way to interpret a mathematical statement.

Model the probability of a frozen yogurt line having 0, 1, or 2 people in it.

Sal shows how to perform a rotation on a pentagon using our interactive widget!

Sal graphs a piecewise function given its formula. In this case, the function consists of three separate lines.

Sal gives a simple proof of the Law of cosines.

Eyeballing the line of best fit