Respuesta :
Answer:
8 ft
Step-by-step explanation:
L x W x H = rectangular prism
rectangular prism = H ÷ W = L
864 ÷ 12 ÷ 9 = 8
The length of Mark's prism is 8 feet
8ft
Because volume is LxWxH so to find height you do 864/12 then 72/9
Because volume is LxWxH so to find height you do 864/12 then 72/9