Petrol costs a certain amount per litre. The table shows the cost of various amounts of petrol.
|Number of litres ($x$x)||$0$0||$10$10||$20$20||$30$30||$40$40|
|Cost of petrol ($y$y)||$0$0||$16.40$16.40||$32.80$32.80||$49.20$49.20||$65.60$65.60|
Write an equation linking the number of litres of petrol pumped ($x$x) and the cost of the petrol ($y$y).
How much does petrol cost per litre?
How much would $47$47 litres of petrol cost at this unit price?
In the equation, $y=1.64x$y=1.64x, what does $1.64$1.64 represent?
A diver starts at the surface of the water and begins to descend below the surface at a constant rate. The table shows the depth of the diver over $5$5 minutes.
There are $20$20 litres of water in a rainwater tank. It rains for a period of 24 hours and during this time, the tank fills up at a rate of $8$8 Litres per hour.
A baseball is thrown vertically upward by a baseball player when he is standing on the ground, and the velocity of the baseball $V$V (in feet per second) after $T$T seconds is given by $V=120-32T$V=120−32T.