1) 12 + (16 - 42) = 12 + (16 - 8) = 12 + 8 = 202) 12 + (8 - 4e) = 12 + 8 - 4e = 20 - 4e3) 2(3p - 40) - 18 = 6p - 80 - 18 = 6p - 984) 4(3p + 25) + 17 = 12p + 100 + 17 = 12p + 117
1) 12 + (16 - 42) = 12 + (16 - 8) = 12 + 8 = 20
2) 12 + (8 - 4e) = 12 + 8 - 4e = 20 - 4e
3) 2(3p - 40) - 18 = 6p - 80 - 18 = 6p - 98
4) 4(3p + 25) + 17 = 12p + 100 + 17 = 12p + 117