Find a formula for a_n (for the geometric sequence), then find the 8th term. Solve for both of these questions, thank you so much!

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

When you answer this can you explain