The general form of the equation of a circle is 7x2 + 7y2 − 28x + 42y − 35 = 0. the equation of this circle in standard form is the center of the circle is at the , and its radius units.

 = 7(x^2 + y^2 - 4x + 6y - 5)= 0

= 7( (x - 2)^2 - 4 + (y + 3)^2 - 9 - 5) = 0

=  7[ (x - 2)^2  + (y + 3)^2 - 18) = 0

center is at (2,-3) and radius = sqrt18  = 4.24 units

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.