Thomas has $6.35 in dimes and quarters. The number of dimes is three more than three times the number of quarters. If a represents the number of quarters, then which of the following expressions represents the number of dimes that
Thomas has?
6.35.9
10(3-3)
30-3
3d - 3

For the first question the answer is a, for the second c, for the third d, for the 4th b, for the 5th a

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.