This is a pond in the shape of a prism. it is completely full of water. colin uses a pump to empty the pond. the level goes down by 20cm in the first 30 minutes. work out how many minutes colin has to wait for the pond to completely empty.

Ms.ortiz sells tomatoes wholesale. the function p(x)=-80x^2+320x-10, graphed below, indicates how much profit she makes on a load of tomatoes if she makes on a load of tomatoes if she sells them for 4-x dollars per kilogram. what should ms.ortiz charge per kilogram of tomatoes to make on a load of tomatoes?