98.368 Because you multiply the two together to get 98.368. Try to use a calculator next time.
Assume the mattress have no width, only length.
By Pythagoras' Theorem, √(72^2 + 80^2) = 107.6 inches.
8-5/5-0= Good Luck! Hope this helped!
The answer to the question
Srry but I can’t figure this one out
