Tangent to a curve at a point - has same slope as graph at this point.
Values for $\Delta$ are always approximations.
-Secant - line passing through two points on a curve
+Secant - line passing through two points on a curve
Chord - line segment joining two points on a curve
Instantaneous rate of change is estimated by using two given points on each side of the concerned point. Evaluate as in average rate of change.
Each point $Q_n<P$ becomes closer to $Q_P$.
-## Position and velocity
+## Limits and Continuity
-Position - location relative to a reference point
+(see spec notes)
-Average velocity - average rate of change in position over time
+## Position and velocity
+Position - location relative to a reference point
+Average velocity - average rate of change in position over time
Instantaneous velocity - calculated the same way as averge $\Delta$
## Derivatives