Find the function value if possible If an answer is undefine

Find the function value, if possible. (If an answer is undefined, enter UNDEFINED.) V(r) = 4 3 r3

a) v(2)

b) v(3/2)

c) v(3r)

Given

V(r)=43r³........................(1)

(a)v(2)

Put r=2 in equation 1

V(2)=43×3.14×(2)³

=1080.16

(b)v(3/2)

Put r=3/2 in equation 1

V(3/2)=43×3.14×(3/2)³

=455.69

(c)v(3r)

Put r=3r in equation 1

V(3r)=43(3r)³

=43×3.14×27r³

=3645.54r³