book Maths Puzzle Numerical Ability

Maria has some money to invest. If she could invest 3000 more, she could qualify for an 11% investment. Otherwise, she could invest the money at 7.5% annual interest. If the 11% in

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book Other Question

how do you answer questions like x^2-4=2 find the exact value of tan 15 degrees WITHOUT USING TABLES OR A CALCULATOR. be sure to show your work.