Select the two values of x that are roots of 7x- 15 = -2x2 I’ll give you brainliest my quiz is due in 20 mins I need help

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.