book Maths Puzzle Numerical Ability

find the exact value of tan 15 degrees WITHOUT USING TABLES OR A CALCULATOR. be sure to show your work.

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book Other Question

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 Is S varies directly as t^2,s=150 when t=5, find s when t=4