Someone help me on Theese 2

W-16=-12 solve each one step equation plz

Determine if the equation defines y as a function of x: 2xy = 1. yes o no

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi,r^3 , where r is the sphere’s radius.