Translate ten times the difference between a number and fifty into a variable expression

Let x represent the unknown number
So the statement in a variable expression is
10 (x - 50)

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .