book Maths Puzzle Numerical Ability

Divide and simplify

3x^2 +13x + 4 / 3x^2-5x-12
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16-x^2 3x-12

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book Other Question

order the following fractions from least to greatest:2/25,7/24,3/17,1/11.
I know I need to find the LCD, but these are large numbers!
Thank you for the help! Will someone please help me with this:
Simplify:
(4x^5/2x^2)-4 this is what I tried:
=2x^3 neg 4th power