Answer:
453m

Explanation:
we know that
The cubic meters of space does the gorilla have to play in her fort is equal to adds the volume of the first box and the volume of the second box
The volume of the box is equal to
V1 = LWH
so
Find the volume of the first box:
V1 = 5*9*9 = 405m

Find the volume of the second box:
V2 = 3*8*2 = 48m

Add V1 and V2.
405m
+ 48m
= 453m

Hope this helps!
If I made a mistake, please let me know!