Answer:
(a).

(b). 18 cm.
Explanation:
We have been given the volume of pyramid is given by the formula
, where B is the area of the base and h is the height.
(a). Let us solve the given formula for h as:
Multiply both sides by
:

Divide both sides by B:


Switch sides:

(b). To find the height for the given pyramid, we will substitute the given values as:



Therefore, the height of the pyramid is 18 cm.