Two angles whose measures have the sum of 180 degrees

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

Clara schumann is buying bagels for her coworkers, she buys a dozen bagels priced at $5.49 a dozen. the bakery's cost for making the bagels is $2.25 per dozen. what is the markup rate based on selling price on a dozen bagels?

What is the factor form of x^2-9x+14