Final answer:
Rose originally had 54 cm of yarn in total. After Mia gave her an extra piece, she had 81 cm in total, which means Mia gave her a piece of 27 cm, but this option is not listed in the given choices.
Step-by-step explanation:
To solve this problem, we need to determine the original total length of yarn Rose had before Mia gave her an additional piece. Rose had 6 pieces of yarn, each 9 cm long, so we first calculate the total length of Rose's yarn by multiplying the number of pieces by the length of each piece:
- 6 pieces × 9 cm/piece = 54 cm
After Mia gives Rose a piece of yarn, the total length becomes 81 cm. Therefore, we subtract the original total length of yarn that Rose had from this new total to find the length of the yarn Mia gave her:
- 81 cm total - 54 cm original = 27 cm
The length of the yarn Mia gives to Rose is 27 cm. However, since this option is not available in the provided choices, it appears there may be an error either in the choices given or in the question. Please review the problem and the choices again.