book Maths Puzzle Numerical Ability

I need help understanding how to write a function in linear equation form. For example, I need to write something to describe "the number of cases handled per person is a function

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Different interest rates. Mrs. Brighton invested $30,000 and received a total of #2,300 in interest. If she invested part of the money at 10% and the remainder at 5%, then how much did she invest at each rate? Simplify (3x^2y) sqrt4x^4y^6.