Mathematics for IGCSE & O level - Graphs In Practical Situations (Section 3 - No. 15)

Which of the following is/are key points mentioned in the provided text?

Conversion graphs can be used to convert from one unit to another.

Travel graphs represent distance against time and show a journey.

The rate of change on a speed-time graph represents the acceleration.

The area under a speed-time graph gives the distance travelled.

All the given options are key points mentioned in the text.