book Maths Puzzle Numerical Ability

n^200<5^300 find the value 0f n.

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book Other Question

A roast was cooked at 325 �F in the oven for 4 hours. The internal temperature rose from 32 �F to 145 �F. What was the average rise in temperature per hour? 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! :)