can some one help me please?

Answer:
all lengths put together is: 21/2 or (as a mixed number:) 10 1/2. hope this helped.
Step-by-step explanation:
1 3/4+ 2 1/4+ 3 3/4 + 2 3/4= 10 1/2. as an improper fraction- 21/2, but I would write 10 1/2 because that's how its writtin in the problem.