Kevin is fencing in his backyard so his kids can play there. The length of the back of his house is feet, and the length of his yard is feet. How much fencing does Kevin need to buy?

Ithink it may be 10^3,that mean 10 'exponent ^3 would the population scientific in terms to evaluate by such and

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.