Answer:
151 degrees
Explanation:
∠3 and ∠4 are on a straight line, therefore they are supplementary. This means that they add to 180 degrees.
∠3+∠4=180
We are given the m∠3, it is 29, so we can substitute that in
29+∠4=180
We want to find the m∠4. To do this, we need to get ∠4 by itself. Subtract 29 from both sides, since 29 is being added to ∠4.
29-29+∠4=180-29
∠4=151
So, the m∠4 is 151 degrees