The volume of a cube shaped fish tank in guy harvey restaurant is 64 cubic feet, the cube-shaped fish tank in the gift shop is 8 cubic feet. what is the difference between the lengths of the sides?

Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point