book Maths Puzzle Numerical Ability

a farmer has 280 meters of fencing and wants to enclose a rectangular area of 4000 square meters.what dimensions should he use?

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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? I am taking college algebra online and am having problems with equations and inequalities: for example: find all real solutions by factoring:
x^3+4x^2-x-4=0

thanks
Sal