Please answer this, as I will be scolded by my mom if I don't. Find the sum or difference. Express each answer in the simplest form. Write your answer in your notebook. 8 + 12 = 20, 40 - 10 = 30, 4 + 2 = 6, 10 - 5 = 5, 28 + 28 = 56, 28 - 8 = 20, 8 + 24 = 32, 12 + 5 = 17, 9 + 2 = 11, 12 + 18 = 30, 28 - 10 = 18, 16 + 18 = 34, 12 + 18 = 30, 15 + 27 = 42, 10 + 36 = 46.