There are 21 goldfish and 7 tetra fish. Write the ratio of goldfish to tetra fish in simplest form.

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

Atransformation t : (x, y) (x-5,y +3) the image of a(2,-1) is

Two numbers have a sum of -19. one number is x. what expression represents the other number?