Hai! You're gonna need 15 shelves for all those toys. X)
Answer:
6(x-3y+6)
Step-by-step explanation:
The correct answer is A. D
That is because D has a horizontal line of symmetry, as can be seen on it.
Answer (13 of the original arrangements are duplicates now, as
AAAF F F FDDDDCC, AAF F F FDDDDCCA, ..., CAAAF F F FDDDDC
are identical): 900900/13 = 69300.
