Question

4)a)-76-(7-18)+[70-(49-81)] b)-(-2)-7-[-18+4+(7-15) c)-{20-(2-10)+[-30-(70)]}

Answer 1

a) -76-(7-18)+[70-(49-81)]
-76-11+[70-32]
-76-11+38=-51
b) -(-2)-7-[-18+4+(7-15)]
2-7-[-18+4-8]
2-7-22=-27
c)-{20-(2-10)+[-30-(70)]}
- {20+8-40)]}=-(-12)=12