HELP ASAPP PLEASEE A sphere has a diameter of 18 inches. What is the volume of the sphere? Use 3.14 for pi.

a
3,052.08 in.^3
b
2,289.06 in.^3
c
9,156.24 in.^3
d
24,416.64 in.^3

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis