This one is so hard what i supposed to do with on

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?

Write and solve a real word problem that involves determining distance on a coordinate plane

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x