What practical examples are there of uses of the real number line in everyday life?
Answer 1:
Mechanical devices for measuring.
Explanation:
Most mechanical devices for measuring contain part of the real number line.
Some examples:
- (Marked) ruler
- Protractor
- Kitchen/bathroom scales
- Micrometer (twice)
- Pressure gauge
- Barometer
Answer 2:
One you probably already use. The axis of a graph.
Answer 3:
The most obvious one we use daily is a thermometer – the temperature can increase from freezing point, but it is possible to have negative temperatures as well.
You can read your altitude on the screen of a GPS unit – it will tell you how high or even how far below sea level you are.