Avideo store sold 2 vhs tapes for every 4 dvds if 564 dvds were sold how many vhs tapes were sold?

Which of the following is the result of expanding

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?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')