Answer:
N+21
Step-by-step explanation:
Im gonna need more information than that. but..
*number* + 21 = new number.
I think they're both trick questions because there are no like terms
DB = 13 cm
ΔCAB ≅ ΔDBA by ASA, so CA ≅ DB by CPCTC.
CA = 13 cm, so DB = 13 cm.