Answer:
He would have 1 3/4 of rope left.
Explanation:
First, you add how much rope you would need for the front and rear spoiler, which would be 1 1/2+1 1/4= 2 3/4
Then, you subtract your sum from the amount of rope you have altogether which would be 4 1/2-2 3/4= 1 3/4
Hope that helped, good luck!