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Linear Perspective: Brunelleschi's Experiment

An introduction to Filippo Brunelleschi's experiment regarding linear perspective, c. 1420, in front of the Baptistry in Florence http://smarthistory.khanacademy.org/Brunelleschi.html

Ex 3 age word problem

William is 4 times as old as Ben. 12 years ago, William was 7 times as old as Ben. How old is Ben now?

Ex 2 age word problem

In 40 years, Imran will be 11 times as old as he is right now. How old is he right now?

Function example problems

Linear Function Graphs

Trolls, tolls, and systems of equations

A troll forces us to use algebra to figure out the make-up of his currency. We end up setting up a system of equations