exam Maths Puzzle Numerical Ability

A total of $10,000 is invested in two funds paying 5% and 7% annual interest. The combined annual interest is $644. How much of the $10,000 is invested in each fund?

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How do you find out what "x" is in this equation: 15-(x-6)=6-(3x+5) write the equation of the line passing through each of the given pairs of points. Write your result in slope-intercept form, where possible (-1,3 and (4, -2)