Answer:
11 feet
Step-by-step explanation:
First, convert all the mixed fractions to improper fractions in the a/b form.
4 1/2 becomes 9/2 and 2 1/2 becomes 5/2.
Adding 9/2 to 5/2 we get (9+5)/2, which is 14/2 and that can be simplified to 7.
Finally, adding 7 to 4 we get 11.
So, the sum of the length of all three tables is just 11 feet long.
Hope this helps!
