book Maths Puzzle Numerical Ability

simplify the rational expression

- x^2 + 10x - 21 / -3x^2 + 23x - 14

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book Other Question

Simplify:
-√[121]+(-1)³
how do u do this problem y=2x+5 u have to make a input output box and i dont know how to do it. i have to get this done tonight can u please please show me?