2,639,456 rounded to the nearest ten-thousand

2,630,000 that's is the answer

2,630,000 is ur answer because ur looking at the 3. its less than 5 so u have to round it down

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