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To find the height of the tent, we can use the Pythagorean theorem.
The slant height (13.5 m) is the hypotenuse of a right triangle formed by the height (h) of the pyramid and half the length of the square base (10 m).
Using the Pythagorean theorem,
h^2 + 10^2 = 13.5^2
h^2 + 100 = 182.25
h^2 = 82.25
h = β82.25
h β 9.1 m
Therefore, the height of the tent is approximately 9.1 meters. The closest answer choice is 9.1 m.