exam Maths Puzzle Numerical Ability

Factor the polynomial.

4s + 6st - 14st squared

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exam Other Question

A certain sum of money is invested at 10%. Twice that amount is invested at 8%. The total amount of interest from both investments is $91.00. How much is invested at 8%. Can you show me how you work it out and solve it? factor:

9x^2 + 3x - 2