Simplified form of (9x^2-25) / (3x-5)

What are the lengths of the legs of a right triangle in which one acute angle measures 19° and the hypotenuse is 15 units long? a. 9 units, 12 unitsb) 11 units, 10.2 unitsc) 4.9 units, 15.8 unitsd) 4.9 units, 14.2 unitse) 5.2 units, 14.1 units

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Which best describes how to solve this equation for x? x/a=b