please help with this question
A = 1/2 BH#17B = 3 H = 4A = 1/2 BHA = 1/2 (3)(4) = 6#18B = 6 H = 4A = 1/2 BHA = 1/2 (6)(4) = 12#19B = 12 H = 8A = 1/2 BHA = 1/2 (12)(8) = 48#20B = 11 H = 5A = 1/2 BHA = 1/2 (11)(5) = 27.5