exam Maths Puzzle Numerical Ability

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

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exam Other Question

please help to graph :

3x - 4y > or equal to 12

2x + y < 1 Walt made an extra $9000.00 lst year from his part time job. He invested part of the money at 9% and the rest at 8%. He made a total of $770.00 in interest. How much was invested at 8%?