questions 1 . 2 . 3 . 4
1.A.add=12B. subtract=7C. subtract= -4D .add=9E. subtract=2F. subtract= -2G. add= -14H. subtract= -12.A.1B.13C.5D.-1E.54F.40G.40H.-33.A.-24B. 24C. -32D. 30E. -60F. -40
