exam Maths Puzzle Numerical Ability

Find all roots of the polynomial x cube-x squared+16x-16.

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exam Other Question

How do I find increses of numbers by percents? For example; Increase 120 by 70%? How would I do that? Thank you! A passenger train can travel 325 mi in the same time a freight train takes to travel 200mi. If the speed of the passenger train is 25 mi/h faster than the speed of the freight train, find the speed of each.

Thanks in advance!
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