Answer:
It would be 5 foot 9 inches shorter.
Explanation:
You need to subtract 7 foot 3 inches from 13 feet. To make this simpler, you can turn the feet into inches. So multiply the 7 be 12, and add 3. 87 inches. Now you need to turn the 13 feet into inches, so multiply the 13 by 12 (because there is 12 inches in 1 foot) That gives you 156. Now subtract,
156-87.
This gives you 69 inches. All you need to do know is convert that into feet. And that gives you 5 feet and 9 inches. So, the board is 5 feet and 9 inches shorter that the long board.
And to check this, you can simply add 5 feet 9 inches to 7 feet 3 inches. Which gives you 13 feet in total.