Owen McClements: The slope of the graph is the curvature, whereas the tangent is a line drawn so that it touches only 1 point on the graph, which you will then be asked to calculate the gradient of (the gradient of the tangent [difference in y co-ordinates divided by the difference in x co-ordinates] is therefore equal to the gradient of the graph at that point. Simran Pal Singh Sahi: Hey Josh I have started watching ur videos like a month ago started from then very first n now m here .. I got my Class 1 license this week .. Anyways jus wanted to add India have 30 recognized languages with more than a million speaker each .. I guess there are more than 500 dialects .. Futanari Hermy: I didn't give you permission to use my pic! njkissler: Lily me too Matt North: pls can u tell me what gearbox the demon x dxr 140 has pls sai kalki: video is not at all clear..... plz improve ur tone. tnk u Ray C: I do need to order these. Had some samples on an order. Great worm.