Solve the equation: (x+2)/(3x) = (x+6)/(3x+5) -29/10 -10/29 7/10 10/7 i don't know

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Write the standard form of an equation with (see picture below)

Find a parametrization for the curve「and determine the work done on a particle moving along γ in r3 through the force field f: r^3--r^3'where f(x,y,z) = (1,-x,z) and (a) im (γ) is the line segment from (0,0,0) to (1,2,1) (b) im (γ) is the polygonal curve with successive vertices (1,0,0), (0,1,1), and (2,2,2) (c) im (γ) is the unit circle in the plane z = 1 with center (0,0,1) beginning and ending at (1,0,1), and starting towards (0,1,1)