exam Maths Puzzle Numerical Ability

please help to graph :

3x - 4y > or equal to 12

2x + y < 1

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exam Other Question

hello i need help to simplify this
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| 18x^5
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| y^2 How do you factor the following problems step by step?

1. 9-x^2
2. 4x^2+81-36x
3. 4y^2+16y+16
4. x^-25/x+5