Synthesize In the Country Databank, look at the languages spoken in these countries. How do they reflect the region's history?

Ido not see an image did you put one on here?

The oldest is  found in the  west pacific and north-west atlantic. 

The correct answer to this question is choice " m∠mnp = (x – y)"

far arc = x
near arc = y

angle mnp = (far arc - near arc) / 2
angle mnp = (x - y) / 2

from the given choices, it is assumed that there is a denominator of 2 that divides the whole expression.