Can someone explain and help me through this because I remember very little, explain with details please:)

How many square feet of out door carpet will we need for this hole? 8ft 3ft 12ft 4ft

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?

The length of a rectangular piece of land is 92 yards more than three times its width. the perimeter is 760 yards. find its dimensions.