book Maths Puzzle Numerical Ability

factor by grouping x^3+6x^2+x+6

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Can someone please help me with this word problem?
Suppose you invest $12,000 in two funds paying 10.5% and 13% smple interest. The total anual interest is $1447.50. How much is i
I do not understand how to solve this inequality:
(3t-4)/3>or = (2t+4)/6+(5t-1)/9

Thank you.