Answer:
18+6=I
Explanation:
The sleeves on the red shirt are 18 inches long.
We are told that the sleeves on the red shirt, 18 inches, are 6 inches shorter than the sleeves of her black shirt, I.
To find the length of the sleeves of the black shirt, we can add 18+6. 18+6=24.
We add because we are told that the length of the sleeves of the red shirt are 18 inches long, which is 6 inches shorter than the sleeves of her black shirt. In order to find the length of the black shirt, we add 6.