Length, L = 3n + 2
Width, W = n - 1
Perimeter, P = 2*(L + W)
= 2*( 3n + 2 + n - 1)
= 2*(3n + n + 2 - 1)
= 2*(4n + 1)
= 2*4n + 2*1
= 8n + 2
Perimeter = (8n + 2)
Perimeter, when n = 4, 8n + 2 = 8*4 + 2 = 32 +2 = 34
Perimeter = 34 inches.
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