I think it is 432.sorry if it is wrong though. My bad calculation error.
Answer:
45x
Step-by-step explanation:
Just expand and coolect to get 9x5=45 and add x
Answer:
The other length is 9 feet.
Step-by-step explanation:
Answer:

Step-by-step explanation:

Logically if you double weight on something it means that you are adding the exact same weight as the first object to the same thing to make it twice the weight as the original, so yes... the weight will double if the length is doubled