Rewrite each expression by combining like terms 12ab-7ab Please help me i need it for my test

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.

How are sas and sss used to show that two triangles are congruent?

East black horse $0.25 total budget is $555 it'll cost $115 for other supplies about how many flyers do you think we can buy