What is 2 x 6,254 =to what by estimating it by rounding

Anyone know? will mark brainliest if correct!

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?

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?