D the carpathian mountains
Northern european according to atlas ... but im not sure ... so I dnt want your to get it wrong... go w your best instinct
I don’t want to spend the time using all the words but I can state why lots of volcanic activity is there because of the ring of fire it is 25,000 miles long and the reason for all of the volcanos is because of all of the convergent boundaries
This seems to be a square, so QTS is 90 degrees.
Another approach is by solving
3x = 5x-30
2x=30
x=15
Then both of those angles are 45 and sum is 90
