The line graph shows the amount of petrol in a car’s tank.
How much petrol was initially in the tank?
What happened at $9$9am and $1$1pm?
How much petrol was used between $1$1pm and $5$5pm?
To the nearest hour, when did the petrol in the tank first fall below $18$18 litres?
The graph represents the number of iTunes sales (in millions) and iPod sales (in hundreds of thousands) every 3 months between 2003 and 2007.
The graph shows the cost of sending parcels of various weight overseas.
The graph shows the parking costs over different lengths of time.