Write the number name for 43,080,700

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

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

See attachment below and find the equivalent of tan(∠qsr)