What is the approximate volume of the sphere?

Question 1:
 The volume of a sphere is given by:
 V = (4/3) * (pi) * (r ^ 3)
 Where,
 r: sphere radio
 Substituting values we have:
 V = (4/3) * (3.14) * ((10/2) ^ 3)
 V = 523.3333333
 Rounding the nearest whole number we have:
 V = 524 m ^ 3
 
 option 1
 V = 524 m ^ 3

 Question 2: 
 The area of a sphere is given by:
 V = (4) * (pi) * (r ^ 2)
 Where,
 r: sphere radio
 Substituting values we have:
 V = (4) * (3.14) * ((15/2) ^ 2)
 V = 706.5
 Rounding the nearest whole number we have:
 V = 706.5 yd ^ 2
 
 V = 706.5 yd ^ 2
 option 2