A15 foot ladder is leaning against a wall. the bottom of the ladder is 5 feet from the wall. to the nearest foot, how far up the wall does the ladderand show work

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?