exam Maths Puzzle Numerical Ability

Write each expression in simplest form.
4r^2 - 25s^2 / 2r^2 + 3rs - 20s^2

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exam Other Question

Find the solution set in interval notation: x+12/x+2 <= 3
Thank you so much!!! :D Solve the system by system:
8x - 4y = 16
y = 2y - 4

This substitutions have gotten me confused, any help would be appreciated. Thanks