Find the range 7,6,5,9,5,8,2 please include work!!

Brent wants to know what is 5 x 1/2

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.

What is the number 321,000,000 in scientific notation? also what is the number? ?