The equation y = 2.50x. can be used to determine the cost of any number of boxes of cereal at Store A. A customer shopped at Store B and spent $12 on 4 boxes of cereal on Monday and $6 on 2 boxes of cereal on Saturday.

Which store sells cereal at a lower price? How do you know?

Answer might be d.i think

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.