book Maths Puzzle Numerical Ability

what is -4+2

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graph the solution set

3x>2x-4
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can you give me the answer on this.
evaluate each expressin if a = 4,b = and c = 7

1. 3ac
2. 5b3
3. abc
4. ab/8
5. 2a-3b
6. b4/4
7. c-a
8. 20-bc
9. ab-c