From a 6 by 6-cm piece of cardboard, square corners are cut out so that the sides can be folded up to make a box. complete parts a through c below. express the volume of the box as a function of the side x, in centimeters, of a cut-out square.

It is going to be the third choice

Planet earth has a mass of 5.9726x10²⁴ kg.then: 5.9726x10²⁴ kg=100% of the total earth mass.if the water´s mass=5x10-4 % of the total mass, we can solve this problem by the rule of three.5.9726x10²⁴ %*10⁻⁴ %x=(5.9726x10²³ kg)(5*10⁻⁴  %) / 100 %=2.9863x10¹⁹ kganswer:   the mass of the planet´s water would be   2.9863 x 10¹⁹ kg.