Is this sequence arithmetic? if so, what is the common difference (d)? 12, 19, 26, 33,

The common difference is found by subtracting one number from the next number on the list.

19 - 12 = 7

26 - 19 = 7

33 - 26 = 7

The common difference is 7.

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct