**1. How do you find the gradient of a curved graph?**

Find the gradient of the tangent (a line that just touches the curve).

**2. What is a normal?**

A

normalto a curve at a particular point is a line a right angles (perpendicular) to the tangent at that point. The equation of the normal is studied in Year 13.

**3. What is the equation of the tangent to a parabola at its base point?**

The equation of the tangent to the turning point of a parabola will be of the form

y = c(i.e. a horizontal line)