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?

Answer 1

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