From the choices given below choose the equation whose graphs are given in fig 4.6 and 4.7 for fig 4.6 1.y=x 2.y=0 3.y=2x 4.2+3y=7x and for fig 4.7 1.y=x+2 2.y=×-2 3.y=-x+2 4.x+2y=6

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.

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I'm not sure you can get negative in holes, but in the case of -3+5=2the total is 2.