In sean's fish tank there are 6 times as many goldfish as guppies. there are a total of 21 fish in the tank. how many more goldfish are there than guppies?

A80-foot piece of siding is cut into three pieces so that the second piece is four times four times as long as the first piece and the third piece is five times as long as the first piece. if x represents the length of the first piece, find the lengths of all three pieces.

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

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?