Answer:
The stack is
inches high.
Step-by-step explanation:
Given date:-
A stack of 7 crates means
1 stack=7 crates
Total number of crate=7
Height of 1 crate = 
Height of 1 crate =
inches
Height of 1 crate =
inches
To find height of stack=?
Now,
Height of a stack = Height of 1 crate
Total number of crates
Height of a stack =
Height of a stack =
Height of stack =
inches
Therefore the stack is
inches high.