1) The number of ice lollies sold, varies directly according to the temperature, T°C. When T= 20°C, the number of ice lollies sold is 300. a) Find an equation connecting N and T.

b) Find the number of ice lollies sold when T= 25°C.

c) Find T when N= 100.

2) The time, T hours, that it takes to drive from A to B varies inversely to the speed S km/h. When S= 50 km/h, T=2 hours.

a) Find an equation connecting S and T.

b) Find T when S=80.

c) Find S when T=1

3) A carton of Apple juice is in the shape of a cuboid with base x cm by 2x cm and height h cm. The carton has a volume of 300cm^3. Find the dimensions that give the minimum surface area of the carton and comment on your answer.