A bridge in the shape of a parabolic arch is modelled by this function (see pic).

Which statements are true? see picture

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?

Select the graph of the solution. click until the correct graph appears. |x| = 3