There are 52 cards in a deck of playing cards in each deck has 13 spades if you pick one card from the deck what is the probability that you will pick a spade?

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.