book Maths Puzzle Numerical Ability

1. -63x^2y/21x^0y^5

2. 10-15x/2x^2-3x^3

3. 81-25x^2/5x+9

4. 8x^2+20x-48/24-16x

Divide and simplify. Thank you!

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book Other Question

If the sides of a square are decreased by 2 cm, the area is decreased by 36 cm^2. What were the dimensions of the original square? what is the answer to y=3x+2 for the input-output table?