Nombre la propiedad aplicada en cada caso: a) 3 + 2 = 2 + 3
b) 2(6 + 3) = 12 + 6
c) (2x)y = 2(xy)
d) 4 + (-4) = 0
f) ( + ) = ( + )
g) 4 + 0 = 4
h) (2 + ) + = 2 + ( + )
i) 3 ⋅ 2 ℝ
j) ( 2 + 1) ℝ

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.