PLS HELP ! I need it

Which of the following equations is of the parabola whose vertex is at (2, 3), axis of symmetry parallel to the y-axis and p = 4? a.)y-3 = 1/16 (x-2)^2 b.)y+3 = -1/16 (x+2)^2 c.)x-2 = 1/16 (y-3)^2

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?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if