All the angles in a triangle equal 180 degrees.
So,
y+40+y+30= 180
2y+70= 180
2y= 110
Divide by 2.
y= 55
"A" is the answer.
I hope this helps!
~kaikers
A Q1 is the minimum Q2 is mode I think and Q3 is the max
Countries could import/obtain more resources by colonizing a land rich in industrial materials, as well as gain a wider market for exporting mainland resources. Having more land also gave a country more power, especially in terms of an expanded military throughout the world.