Answer:
Option B. [tex]21.6\ in[/tex]
Step-by-step explanation:
we know that
The volume of the mold is equal to
[tex]V=Bh[/tex]
where
B is the area of the base of the mold
h is the height of the mold
In this problem we have
[tex]V=324\ in^{3}[/tex]
[tex]B=15\ in^{2}[/tex]
substitute and solve for h
[tex]324=(15)h[/tex]
[tex]h=324/15=21.6\ in[/tex]
