Answer:

Step-by-step explanation:
Q is a point on the line segment PR.
PQ = 3
QR = 11
PR = PQ + QR
PR = 3 + 11 = 14
Volume of square pyramid can be calculated by the formula :
V=
a is the length of base and h is the height of the pyramid.
In the given figure a= x in.and h =
in.
Volume of pyramid given V =486 cubic inches.
Substituting these values in volume of pyramid we have:
486=
÷ 3
Or 486=
486= 
Multiplying both sides by 12
5832 =

Or x= 18 in.
I would answer the question but there are no answer choices, so if you could add that maybe I could help! :)
The answer would be 7.99.