<u>Answer:</u>
m∠3 = 49°
<u>Step-by-step explanation:</u>
We are given that the angles m∠1 = 50° and m∠2 = 48° and the line s bisects ∠ABC.
If m∠1 = 50° and m∠2 = 48°, then ∠DEF = 50 + 48 = 98°
So ∠DEB will be equal to = 180 - 98 = 82°
If ∠DEB = 82°, then the angle from A to B will 180 - 82 = 98°.
We know that the line s bisects ∠ABC, therefore the measure of angle m∠3 will be half of 98 = 49°