book Maths Puzzle Numerical Ability

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

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last year pete decided to invest half of his money in a credit union paying 4.5% interest, one-third of his money in a mutual fund paying 5% interest, and the rest of his money in apply the quadratic formula to find the roots of the given function, and then graph the function.

f(x) = x^2 + 4