A food truck vendor averages 150 tacos sold when the price per taco is 84. A study shows that the average number of tacos sold will increase by 25 tacos for every $1 that the price per taco lowered
Which equation models the food truck's average sales in dollars, s, in terms of the price per taco, x?

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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.