Please help, will be greatful!

Find the third,fifth and seventh term sequence described by each rule a(n)=n+1

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years