Will give brainliest to answer with work and correct The side of a square is measured to be 10 ft with a possible error of ±0.1 ft. Use LINEAR APPROXIMATION or DIFFERENTIALS to estimate the error in the calculated area. Include units in your answer.

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?

Extra points! find the missing dimension! need asap

Ihonestly have no clue if it's each or none.