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the sum of the four angle measures of any convex quadrilateral is 360 degrees. if a certain convex quadrilater has angle measures of 60, 2y-10, and 10y+5 degrees, what is an expression for the degrees measure of the fourth angle?

  • algebra -

    Ø + 60 + 2y-10 + 10y + 5 = 360
    Ø = 305 - 12y

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