What is the length of PR? O
5
Ο Α. 7
Ο Β. 9
Ο Ο Ο Ο
C. 63
D. 11
SUOMI

I’ve taken this before. the answer is c

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.

This seems very interesting. i think i can !