A planet has an approximate radius of 8×108 m. Assuming the planet is spherical, find its volume in km3. Give your answer in standard form to 3SF.
The volume of a sphere is 43πr3.
V = (4 π a^3)/3
Since you have the formula for the volume, you have the radius (a^3)==[8 x 10^8 m]^3, why can't you just substitute in the formula and find the volume? Or are you too busy playing video games or whatever? Don't expect people to do your homework for you, lazy! Come on get on with it.