Answer:
Perimeter A = 24x - 36
Perimeter B = 17x - 1
Explanation:
garden A 
 
Width (W) = 2x - 3 
Length (L) = 5(W) 
 = 5 (2x - 3) 
 = 10x - 15 
 
Perimeter A = 2L + 2W (perimeter of a rectangular garden) 
 = 2(10x - 15) + 2(2x - 3) 
 = 20x - 30 + 4x - 6 
 = 24x - 36 
 
garden B 
 side 1 = 5x + 5 
side 2 = 4x + 2 
side 3 = 8x - 8 
Perimeter B = sides (1 + 2 + 3) 
 = 5x+5 + 4x+2 + 8x-8 
 = 5x + 4x + 8x + 5 + 2 - 8 
 = 17x - 1