The president has nominated the next ambassador to canada. what must happen before the ambassador can take office?

To answer your question on What must happen before the ambassador can take office? Their appointment needs to be confirmed by the United States Senate. An ambassador can be appointed during a recess, but he or she can only serve as ambassador until the end of the next session of Congress unless subsequently confirmed.

answer; i believe that the correct answer is (decreased)

what is the tax base for the sales tax?

it should be (usually ) 6%