Walking through the ancient Nabataean city of Petra can be a challenge. A tour begins with a 20-minute walk down a rocky slope through the narrow Siq to get to the famous Treasury known to Indiana Jones fans. But that is...

This CoolMath Resource will help students determine if lines are perpendicular by finding the slope, using the point-slope formula, and graphing.

This site goes through a step by step example of how to find the equation of the tangent to a curve using the derivative.