book Maths Puzzle Numerical Ability

Simplify by dividing:

x^3+2x^2+3x-6/x-1

I don't understand why I can't do this, but I know once I see it I'll hopefully understand! :)

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book Other Question

You have a coin bank containing dimes, nickles, and quarters. You grab a handful and find that you have 4 dimes, 7 nickles, and 3 quarters. Find the probability that each is the What Does t equal in 8t-r=12t