Which equation has exactly ONE solution? A) 2 + 6x 2 = 3x + 1 B) 8 − 4x 10 = 8 + 2x C) 15x − 5 3 = 5x + 4 D) 4x − 10 2 = 2x − 5

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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.