4. Evaluate the following: -12 7 -5 22 + + -5 -3 14 + 7 15 5 5. Divide the sum of -2 and 3 by their difference. 17 34 6. During a festival sale, the cost of an object is 870 on which 20% is off. The same object is available at other shops for 975 with a discount of 6%. Which is a better deal and by how much? 7. Simplify: 1 21.5 5 of (20.5 - 5.5) + 0.5 x 8.5 -