exam Maths Puzzle Numerical Ability

You invest $6000 in two accounts paying 9% and 6% anual interest. At the end of the year, the total interest from these investments was $480. How much was invested at each rate?

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Given f(x)=4+3x-x^2 ,find and simplify f(h+5) - f(h-3) Ata distance of 0.5 miles from the runway, the noise level of a supersonic transport plane at takeoff is approximately 150 decibels. What is the sound wave intensity in watts per s