Question

I don't know how to do math lol​

Answer 1

Ima guess 60

Explanation:

Answer 2

9514 1404 393

Answer:

60°

Explanation:

The exterior angle is equal to the sum of the remote interior angles:

100° = 40° +∠B

60° = ∠B . . . . . . . . . . . . . subtract 40° from both sides