An object is launched from ground level with an initial velocity of 400 feet per second. to the nearest tenth of a second, how long does it take the object to reach a height of 650 feet? [use the formula h = -16t2 + v0t + s0.]

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.