Lines l and m are parallel. Parallel lines l and m are intersected by lines s and t. At the intersection of lines l, s, and t, clockwise from the top left, the angles are blank, 50 degrees, (x + 25) degrees, (2 x) degrees, 1, blank. Lines t, s, and m create a triangle with angles 1, 2, 3. Use the diagram to determine the measure of ∠3.

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.

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