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To solve for x, we need to know that the angles inside of a triangle is always equal to 180º.
Since all the angles added together are equal to 180º, we simply have to add the two given angles and subtract that from 180º.
You can always match 4 points using a cubic polynomial. A graphing calculator can find a cubic regression equation for you. This set of points is matched by
.. y = x^3 +3x^2 +5x +3
.. y = x^3 +3x^2 +5x +3