1B 2D 3A 4D 5D 6D 7A 8A 9C 10D 11A 12D 13C 14A
15B 16A 17B 18B 19) 82      20a) A=64(2s-1)     20b) 1856 cm^2

Extra practice: p 110-111 #2-4 odd letters, #5 even letters, p 161-165 even letters.