exam Maths Puzzle Numerical Ability

solve for r: A="pie"r"squared"

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I need help with this homeowrk problem. It states: find the inverse of the function f(x)={(-4,-6),(-6,-4),(-5,-3)} Lina Chen invest $24,000, part at 8% and the rest 7.2%. How much did she invest at each rate if her income from the 8% investment is two thirds that of the 7.2% investment?